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_name_21 (density_per_km² INTEGER, number__map_ VARCHAR, area_in_km² VARCHAR)

### Question ###
Which Density per km² is the lowest one that has a Number (map) smaller than 13, and an Area in km² of 11.1?

### Accurate SQL ###

SELECT MIN(density_per_km²) FROM table_name_21 WHERE number__map_ < 13 AND area_in_km² = 11.1