Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_21994729_3 (series__number INTEGER, prod_code VARCHAR)
### Question:
how many maximum series number have 2apx05 prod. code.
### Answer:
SELECT MAX(series__number) FROM table_21994729_3 WHERE prod_code = "2APX05"