CREATE TABLE table_25112 ("#" FLOAT, "Name" TEXT, "Name  ( English ) " TEXT, "Population 2008-07-01" FLOAT, "Area  ( km\\u00b2 ) " FLOAT, "Pop./ km\\u00b2" TEXT, "ISO 3166-2" TEXT, "Administrative centre" TEXT)

when the area (km ) is 22721, what is the pop./ km ?
SELECT "Pop./ km\u00b2" FROM table_25112 WHERE "Area (km\u00b2)" = '22721'
SELECT "Pop./ km\u00b2" FROM "table_25112" WHERE "Area (km\u00b2)" = '22721'