What is the number of leading scorer of february 21?
CREATE TABLE "february" (
  "num" real,
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "leading_scorer" text,
  "attendance" text,
  "record" text,
  "streak" text
);
SELECT COUNT("leading_scorer") FROM "february" WHERE "date"='February 21';