What is the episode number of the episode broadcast on 21 September 2001?
CREATE TABLE table_name_79 (
    episode_number VARCHAR,
    broadcast_date VARCHAR
)
SELECT episode_number FROM table_name_79 WHERE broadcast_date = "21 september 2001"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the episode number of the episode broadcast on 21 September 2001? ### Input: CREATE TABLE table_name_79 (
    episode_number VARCHAR,
    broadcast_date VARCHAR
) ### Response: SELECT episode_number FROM table_name_79 WHERE broadcast_date = "21 september 2001"