21900868 has 24 divisors (see below), whose sum is σ = 42043680. Its totient is φ = 9899520.

The previous prime is 21900833. The next prime is 21900883. The reversal of 21900868 is 86800912.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7203 + ... + 9781.

It is an arithmetic number, because the mean of its divisors is an integer number (1751820).

Almost surely, 2^21900868 is an apocalyptic number.

It is an amenable number.

21900868 is a deficient number, since it is larger than the sum of its proper divisors (20142812).

21900868 is a wasteful number, since it uses less digits than its factorization.

21900868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2787 (or 2785 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 21900868 is about 4679.8363219241. The cubic root of 21900868 is about 279.7824330297.

The spelling of 21900868 in words is "twenty-one million, nine hundred thousand, eight hundred sixty-eight".