Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_79 (episode_number VARCHAR, broadcast_date VARCHAR)
### Question:
What is the episode number of the episode broadcast on 21 September 2001?
### Answer:
SELECT episode_number FROM table_name_79 WHERE broadcast_date = "21 september 2001"