CREATE TABLE table_10534 ("Number" FLOAT, "District" CLOB, "Size km\\u00b2" FLOAT, "Population" FLOAT, "Density hab/km" FLOAT, "Councilman" CLOB, "Party" CLOB)

what is the size km when the density hab/km is 8,321?
SELECT SUM("Size km\u00b2") FROM table_10534 WHERE "Density hab/km" = '8,321'
SELECT SUM("Size km\u00b2") FROM "table_10534" WHERE "Density hab/km" = '8,321'