diff --git a/src/AryUtil.chpl b/src/AryUtil.chpl
index 929d9fc1cd..365d10cd3e 100644
--- a/src/AryUtil.chpl
+++ b/src/AryUtil.chpl
@@ -15,6 +15,7 @@ module AryUtil
     use List;
     use CommAggregation;
     use CommPrimitives;
+    use BigInteger;
 
 
     param bitsPerDigit = RSLSD_bitsPerDigit;
@@ -905,7 +906,8 @@ module AryUtil
     /*
       unflatten a 1D array into a multi-dimensional array of the given shape
     */
-    proc unflatten(const ref a: [?d] ?t, shape: ?N*int): [] t throws {
+    proc unflatten(const ref a: [?d] ?t, shape: ?N*int): [] t throws
+      where t!=bigint {
       var unflat = makeDistArray((...shape), t);
 
       if N == 1 {
@@ -952,7 +954,6 @@ module AryUtil
             // flat region is spread across multiple locales, do a get for each source locale
             for locInID in locInStart..locInStop {
               const flatSubSlice = flatSlice[flatLocRanges[locInID]];
-
               get(
                 c_ptrTo(unflat[dufc.orderToIndex(flatSubSlice.low)]),
                 getAddr(a[flatSubSlice.low]),
@@ -967,11 +968,30 @@ module AryUtil
       return unflat;
     }
 
+    proc unflatten(const ref a: [?d] ?t, shape: ?N*int): [] t throws
+      where t==bigint {
+      var unflat = makeDistArray((...shape), t);
+
+      if N == 1 {
+        unflat = a;
+        return unflat;
+      }
+
+      coforall loc in Locales with (ref unflat) do on loc {
+        forall idx in a.localSubdomain() with (var agg = newDstAggregator(t)) {
+          agg.copy(unflat[unflat.domain.orderToIndex(idx)], a[idx]);
+        }
+      }
+
+      return unflat;
+    }
+
     /*
       flatten a multi-dimensional array into a 1D array
     */
-    @arkouda.registerCommand
-    proc flatten(const ref a: [?d] ?t): [] t throws {
+    @arkouda.registerCommand(ignoreWhereClause=true)
+    proc flatten(const ref a: [?d] ?t): [] t throws
+      where t!=bigint {
       if a.rank == 1 then return a;
 
       var flat = makeDistArray(d.size, t);
@@ -1030,6 +1050,22 @@ module AryUtil
       return flat;
     }
 
+
+    proc flatten(const ref a: [?d] ?t): [] t throws
+      where t==bigint {
+      if a.rank == 1 then return a;
+
+      var flat = makeDistArray(d.size, t);
+
+      coforall loc in Locales with (ref flat) do on loc {
+        forall idx in flat.localSubdomain() with (var agg = newSrcAggregator(t)) {
+          agg.copy(flat[idx], a[a.domain.orderToIndex(idx)]);
+        }
+      }
+
+      return flat;
+    }
+
     // helper for computing an array element's index from its order
     record orderer {
       param rank: int;
@@ -1044,10 +1080,10 @@ module AryUtil
       // index -> order for the input array's indices
       // e.g., order = k + (nz * j) + (nz * ny * i)
       inline proc indexToOrder(idx: rank*?t): t
-      where (t==int) || (t==uint(64)) {
-        var order : t = 0;
-        for param i in 0..<rank do order += idx[i] * accumRankSizes[rank - i - 1];
-        return order;
-      }
+        where (t==int) || (t==uint(64)) {
+          var order : t = 0;
+          for param i in 0..<rank do order += idx[i] * accumRankSizes[rank - i - 1];
+          return order;
+        }
     }
 }
diff --git a/tests/pdarrayclass_test.py b/tests/pdarrayclass_test.py
index d017d27d5b..bda2a9bbd9 100644
--- a/tests/pdarrayclass_test.py
+++ b/tests/pdarrayclass_test.py
@@ -22,35 +22,47 @@
 class TestPdarrayClass:
 
     @pytest.mark.skip_if_max_rank_less_than(2)
-    def test_reshape(self):
-        a = ak.arange(4)
+    @pytest.mark.parametrize("dtype", DTYPES)
+    def test_reshape(self, dtype):
+        a = ak.arange(4, dtype=dtype)
         r = a.reshape((2, 2))
         assert r.shape == (2, 2)
         assert isinstance(r, ak.pdarray)
 
-    def test_shape(self):
-        a = ak.arange(4)
+    @pytest.mark.skip_if_max_rank_less_than(3)
+    def test_reshape_and_flatten_bug_reproducer(self):
+        dtype = "bigint"
+        size = 10
+        x = ak.arange(size, dtype=dtype).reshape((1, size, 1))
+        ak_assert_equal(x.flatten(), ak.arange(size, dtype=dtype))
+
+    @pytest.mark.parametrize("dtype", DTYPES)
+    def test_shape(self,dtype):
+        a = ak.arange(4,dtype=dtype)
         np_a = np.arange(4)
         assert isinstance(a.shape, tuple)
         assert a.shape == np_a.shape
 
     @pytest.mark.skip_if_max_rank_less_than(2)
-    def test_shape_multidim(self):
-        a = ak.arange(4).reshape((2, 2))
-        np_a = np.arange(4).reshape((2, 2))
+    @pytest.mark.parametrize("dtype", list(set(DTYPES) - set(["bool"])))
+    def test_shape_multidim(self,dtype):
+        a = ak.arange(4,dtype=dtype).reshape((2, 2))
+        np_a = np.arange(4,dtype=dtype).reshape((2, 2))
         assert isinstance(a.shape, tuple)
         assert a.shape == np_a.shape
 
     @pytest.mark.parametrize("size", pytest.prob_size)
-    def test_flatten(self, size):
-        a = ak.arange(size)
+    @pytest.mark.parametrize("dtype", DTYPES)
+    def test_flatten(self, size,dtype):
+        a = ak.arange(size,dtype=dtype)
         ak_assert_equal(a.flatten(), a)
 
     @pytest.mark.skip_if_max_rank_less_than(3)
+    @pytest.mark.parametrize("dtype", DTYPES)
     @pytest.mark.parametrize("size", pytest.prob_size)
-    def test_flatten(self, size):
+    def test_flatten(self, size,dtype):
         size = size - (size % 4)
-        a = ak.arange(size)
+        a = ak.arange(size,dtype=dtype)
         b = a.reshape((2, 2, size / 4))
         ak_assert_equal(b.flatten(), a)
 
@@ -104,11 +116,12 @@ def test_is_locally_sorted(self, size, dtype, axis):
     @pytest.mark.skip_if_nl_greater_than(2)
     @pytest.mark.skip_if_nl_less_than(2)
     @pytest.mark.parametrize("size", pytest.prob_size)
-    def test_is_locally_sorted_multi_locale(self, size):
+    @pytest.mark.parametrize("dtype", DTYPES)
+    def test_is_locally_sorted_multi_locale(self, size,dtype):
         from arkouda.pdarrayclass import is_locally_sorted, is_sorted
 
         size = size // 2
-        a = ak.concatenate([ak.arange(size), ak.arange(size)])
+        a = ak.concatenate([ak.arange(size,dtype=dtype), ak.arange(size,dtype=dtype)])
         assert is_locally_sorted(a)
         assert not is_sorted(a)