21266650 has 12 divisors (see below), whose sum is σ = 39556062. Its totient is φ = 8506640.

The previous prime is 21266633. The next prime is 21266669. The reversal of 21266650 is 5666212.

It can be written as a sum of positive squares in 3 ways, for example, as 19775809 + 1490841 = 4447^2 + 1221^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 212617 + ... + 212716.

Almost surely, 2^21266650 is an apocalyptic number.

21266650 is a deficient number, since it is larger than the sum of its proper divisors (18289412).

21266650 is a wasteful number, since it uses less digits than its factorization.

21266650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425345 (or 425340 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 21266650 is about 4611.5778210933. The cubic root of 21266650 is about 277.0552353717.

The spelling of 21266650 in words is "twenty-one million, two hundred sixty-six thousand, six hundred fifty".