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_name_56 (silver INTEGER, bronze VARCHAR, gold VARCHAR)
### Question:
What is the fewest number of silvers for teams with more than 21 gold and more than 4 bronze?
### Answer:
SELECT MIN(silver) FROM table_name_56 WHERE bronze > 4 AND gold > 21