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_21636599_1 (insurgents INTEGER, total_per_period VARCHAR)

### Question ###
How many insurgents have 602 as the total per period?

### Accurate SQL ###

SELECT MAX(insurgents) FROM table_21636599_1 WHERE total_per_period = 602