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_25016555_5 (blocks VARCHAR, assists VARCHAR)
### Question:
When 21 is the number of assists how many sets of blocks are there?
### Answer:
SELECT COUNT(blocks) FROM table_25016555_5 WHERE assists = 21