CREATE TABLE table_16649 ("#" FLOAT, "Episode" TEXT, "Air Date" TEXT, "Rating" TEXT, "Share" FLOAT, "Rating/Share 18\\u201349" TEXT, "Viewers  ( m ) " TEXT, "Timeslot Rank" FLOAT, "Night Rank" TEXT, "Overall Rank" FLOAT)

what's the overall rank with rating/share 18 49 of 2.1/5
SELECT COUNT("Overall Rank") FROM table_16649 WHERE "Rating/Share 18\u201349" = '2.1/5'
SELECT COUNT("Overall Rank") FROM "table_16649" WHERE "Rating/Share 18\u201349" = '2.1/5'