21692868 has 24 divisors (see below), whose sum is σ = 50703072. Its totient is φ = 7218624.

The previous prime is 21692857. The next prime is 21692903. The reversal of 21692868 is 86829612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8296 + ... + 10592.

It is an arithmetic number, because the mean of its divisors is an integer number (2112628).

Almost surely, 2^21692868 is an apocalyptic number.

It is an amenable number.

21692868 is an abundant number, since it is smaller than the sum of its proper divisors (29010204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21692868 is a wasteful number, since it uses less digits than its factorization.

21692868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3091 (or 3089 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 21692868 is about 4657.5603055677. The cubic root of 21692868 is about 278.8938844403.

The spelling of 21692868 in words is "twenty-one million, six hundred ninety-two thousand, eight hundred sixty-eight".