CREATE TABLE table_24698 ("No." FLOAT, "#" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( million ) " TEXT)

what is the smallest series episode number whose production code is 2t7211?
SELECT MIN("No.") FROM table_24698 WHERE "Production code" = '2T7211'
SELECT MIN("No.") FROM "table_24698" WHERE "Production code" = '2T7211'