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_2252745_1 (pop__km² VARCHAR, area__km²_ VARCHAR)
### Question:
when the area (km²) is 22721, what is the pop./ km²?
### Answer:
SELECT pop__km² FROM table_2252745_1 WHERE area__km²_ = 22721