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_28196105_1 (_number VARCHAR, production_code VARCHAR)
### Question:
What was the number of episodes whose production code is 7ABB21?
### Answer:
SELECT COUNT(_number) FROM table_28196105_1 WHERE production_code = "7ABB21"