21925868 has 12 divisors (see below), whose sum is σ = 38508792. Its totient is φ = 10923360.

The previous prime is 21925853. The next prime is 21925879. The reversal of 21925868 is 86852912.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8630 + ... + 10877.

It is an arithmetic number, because the mean of its divisors is an integer number (3209066).

Almost surely, 2^21925868 is an apocalyptic number.

It is an amenable number.

21925868 is a deficient number, since it is larger than the sum of its proper divisors (16582924).

21925868 is a wasteful number, since it uses less digits than its factorization.

21925868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19792 (or 19790 counting only the distinct ones).

The product of its digits is 69120, while the sum is 41.

The square root of 21925868 is about 4682.5065936953. The cubic root of 21925868 is about 279.8888504414. Note that the first 4 decimals are identical.

The spelling of 21925868 in words is "twenty-one million, nine hundred twenty-five thousand, eight hundred sixty-eight".