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_17810099_3 ( title VARCHAR, episode__number VARCHAR )

### Question ###
what was the title of the episode 21a?

### Accurate SQL ###

SELECT title FROM table_17810099_3 WHERE episode__number = "21a"