CREATE TABLE table_63910 ("Rank" FLOAT, "Lane" FLOAT, "Athlete" TEXT, "Nationality" TEXT, "Time" FLOAT, "Notes" TEXT)

What is the nationality with a 13.21 time?
SELECT "Nationality" FROM table_63910 WHERE "Time" = '13.21'
SELECT "Nationality" FROM "table_63910" WHERE "Time" = '13.21'