Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_24798489_2 ( original_airdate VARCHAR, episode_number VARCHAR )

### Question ###
How many original air dates were there for episode 22?

### Accurate SQL ###

SELECT COUNT(original_airdate) FROM table_24798489_2 WHERE episode_number = 22