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_21696800_1 (_number VARCHAR, us_viewers__million_ VARCHAR)
### Question:
What's the number of the episode seen by 2.24 million people in the US?
### Answer:
SELECT _number FROM table_21696800_1 WHERE us_viewers__million_ = "2.24"