Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_21284653_1 ( change___percentage_ VARCHAR, area__km²_ VARCHAR )

### Question ###
What is the change (%) when the area size (km2) is 247.21?

### Accurate SQL ###

SELECT change___percentage_ FROM table_21284653_1 WHERE area__km²_ = "247.21"