What is the land area of the RCM having a density of 21.1?
CREATE TABLE table_73312 (
    "Regional County Municipality (RCM)" text,
    "Population Canada 2011 Census" real,
    "Land Area" text,
    "Density (pop. per km2)" text,
    "Seat of RCM" text
)
SELECT "Land Area" FROM table_73312 WHERE "Density (pop. per km2)" = '21.1'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the land area of the RCM having a density of 21.1? ### Input: CREATE TABLE table_73312 (
    "Regional County Municipality (RCM)" text,
    "Population Canada 2011 Census" real,
    "Land Area" text,
    "Density (pop. per km2)" text,
    "Seat of RCM" text
) ### Response: SELECT "Land Area" FROM table_73312 WHERE "Density (pop. per km2)" = '21.1'