diff --git a/django/db/backends/sqlite3/base.py b/django/db/backends/sqlite3/base.py
index cf0326db279..3c8f170b7d9 100644
--- a/django/db/backends/sqlite3/base.py
+++ b/django/db/backends/sqlite3/base.py
@@ -223,12 +223,12 @@ class DatabaseOperations(BaseDatabaseOperations):
         except _sqlite3.ProgrammingError:
             pass
         # Manual emulation of SQLite parameter quoting
-        if isinstance(value, six.integer_types):
+        if isinstance(value, type(True)):
+            return str(int(value))
+        elif isinstance(value, six.integer_types):
             return str(value)
         elif isinstance(value, six.string_types):
             return '"%s"' % six.text_type(value)
-        elif isinstance(value, type(True)):
-            return str(int(value))
         elif value is None:
             return "NULL"
         else:
diff --git a/django/db/backends/sqlite3/schema.py b/django/db/backends/sqlite3/schema.py
index 1ad5bfc17bb..cd80d457c6f 100644
--- a/django/db/backends/sqlite3/schema.py
+++ b/django/db/backends/sqlite3/schema.py
@@ -30,7 +30,7 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
         for field in create_fields:
             body[field.name] = field
             # If there's a default, insert it into the copy map
-            if field.get_default():
+            if field.has_default():
                 mapping[field.column] = self.connection.ops.quote_parameter(
                     field.get_default()
                 )
diff --git a/tests/schema/tests.py b/tests/schema/tests.py
index 88388ac0b49..99805c45c7e 100644
--- a/tests/schema/tests.py
+++ b/tests/schema/tests.py
@@ -4,7 +4,7 @@ import unittest
 
 from django.test import TransactionTestCase
 from django.db import connection, DatabaseError, IntegrityError, OperationalError
-from django.db.models.fields import IntegerField, TextField, CharField, SlugField
+from django.db.models.fields import IntegerField, TextField, CharField, SlugField, BooleanField
 from django.db.models.fields.related import ManyToManyField, ForeignKey
 from django.db.transaction import atomic
 from .models import (Author, AuthorWithM2M, Book, BookWithLongName,
@@ -185,6 +185,32 @@ class SchemaTests(TransactionTestCase):
         self.assertEqual(columns['surname'][1][6],
                          connection.features.interprets_empty_strings_as_nulls)
 
+    def test_add_field_temp_default_boolean(self):
+        """
+        Tests adding fields to models with a temporary default where
+        the default is False. (#21783)
+        """
+        # Create the table
+        with connection.schema_editor() as editor:
+            editor.create_model(Author)
+        # Ensure there's no age field
+        columns = self.column_classes(Author)
+        self.assertNotIn("age", columns)
+        # Add some rows of data
+        Author.objects.create(name="Andrew", height=30)
+        Author.objects.create(name="Andrea")
+        # Add a not-null field
+        new_field = BooleanField(default=False)
+        new_field.set_attributes_from_name("awesome")
+        with connection.schema_editor() as editor:
+            editor.add_field(
+                Author,
+                new_field,
+            )
+        # Ensure the field is right afterwards
+        columns = self.column_classes(Author)
+        self.assertEqual(columns['awesome'][0], "BooleanField")
+
     def test_alter(self):
         """
         Tests simple altering of fields