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_24910733_1 ( directed_by VARCHAR, us_viewers__millions_ VARCHAR )

### Question ###
Who is the director when there is 11.21 million viewers?

### Accurate SQL ###

SELECT directed_by FROM table_24910733_1 WHERE us_viewers__millions_ = "11.21"