CREATE TABLE table_28754 ("Episode number  ( Production number ) " TEXT, "Title" TEXT, "Original air date" TEXT, "Total viewers on FX" TEXT, "Total viewers on FX+" TEXT, "Total viewers" TEXT, "Rank on channel" TEXT)

Name the rank on channel for january 21, 2011
SELECT "Rank on channel" FROM table_28754 WHERE "Original air date" = 'January 21, 2011'
SELECT "Rank on channel" FROM "table_28754" WHERE "Original air date" = 'January 21, 2011'