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_21994729_3 (series__number INTEGER, prod_code VARCHAR)

### Question ###
how many maximum series number have 2apx05 prod. code.

### Accurate SQL ###

SELECT MAX(series__number) FROM table_21994729_3 WHERE prod_code = "2APX05"