human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Regional County Municipality (RCM), Population Canada 2011 Census, Land Area, Density (pop. per km2), Seat of RCM
###Question: What is the land area of the RCM having a density of 21.1?
gpt
SELECT Land Area FROM table WHERE Density (pop. per km2) = 21.1