21885928 has 16 divisors (see below), whose sum is σ = 41180580. Its totient is φ = 10904448.

The previous prime is 21885917. The next prime is 21885937. The reversal of 21885928 is 82958812.

It can be written as a sum of positive squares in 2 ways, for example, as 15824484 + 6061444 = 3978^2 + 2462^2 .

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, 2325 + ... + 7012.

Almost surely, 2^21885928 is an apocalyptic number.

It is an amenable number.

21885928 is a deficient number, since it is larger than the sum of its proper divisors (19294652).

21885928 is a wasteful number, since it uses less digits than its factorization.

21885928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9636 (or 9632 counting only the distinct ones).

The product of its digits is 92160, while the sum is 43.

The square root of 21885928 is about 4678.2398399398. The cubic root of 21885928 is about 279.7187993207.

The spelling of 21885928 in words is "twenty-one million, eight hundred eighty-five thousand, nine hundred twenty-eight".