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_21734764_1 (population_density___km²_2010_ VARCHAR, population_2010_census VARCHAR)

### Question ###
What is the population density of the administrative division with a population in 2010 of 264170 according to the census?

### Accurate SQL ###

SELECT population_density___km²_2010_ FROM table_21734764_1 WHERE population_2010_census = 264170