21924872 has 16 divisors (see below), whose sum is σ = 41806800. Its totient is φ = 10776400.

The previous prime is 21924869. The next prime is 21924901. The reversal of 21924872 is 27842912.

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, 22754 + ... + 23697.

It is an arithmetic number, because the mean of its divisors is an integer number (2612925).

Almost surely, 2^21924872 is an apocalyptic number.

It is an amenable number.

21924872 is a deficient number, since it is larger than the sum of its proper divisors (19881928).

21924872 is a wasteful number, since it uses less digits than its factorization.

21924872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46516 (or 46512 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 21924872 is about 4682.4002391936. The cubic root of 21924872 is about 279.8846123193.

The spelling of 21924872 in words is "twenty-one million, nine hundred twenty-four thousand, eight hundred seventy-two".