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_29087004_2 ( series__number INTEGER, united_states_original_airdate VARCHAR )

### Question ###
What number episode in the series had and original United States air date of December 24, 2010?

### Accurate SQL ###

SELECT MAX(series__number) FROM table_29087004_2 WHERE united_states_original_airdate = "December 24, 2010"