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_23392257_4 (original_airdate VARCHAR, _number VARCHAR)
### Question:
What date did Episode 22 originally air?
### Answer:
SELECT COUNT(original_airdate) FROM table_23392257_4 WHERE _number = 22