diff --git a/packages/eslint-plugin/src/rules/no-redundant-type-constituents.ts b/packages/eslint-plugin/src/rules/no-redundant-type-constituents.ts
index 33237a8ae4e2..8d57fbf739bf 100644
--- a/packages/eslint-plugin/src/rules/no-redundant-type-constituents.ts
+++ b/packages/eslint-plugin/src/rules/no-redundant-type-constituents.ts
@@ -83,7 +83,13 @@ function describeLiteralType(type: ts.Type): string {
   }
 
   if (type.isLiteral()) {
-    return type.value.toString();
+    if (typeof type.value === 'string' || typeof type.value === 'number') {
+      return type.value.toString();
+    }
+    // Print ts.PseudoBigInt
+    return `${
+      type.value.negative ? '-' : ''
+    }${type.value.base10Value.toString()}n`;
   }
 
   if (util.isTypeAnyType(type)) {