21104968 has 16 divisors (see below), whose sum is σ = 39836160. Its totient is φ = 10482000.

The previous prime is 21104947. The next prime is 21104981. The reversal of 21104968 is 86940112.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7528 + ... + 9943.

It is an arithmetic number, because the mean of its divisors is an integer number (2489760).

Almost surely, 2^21104968 is an apocalyptic number.

It is an amenable number.

21104968 is a deficient number, since it is larger than the sum of its proper divisors (18731192).

21104968 is a wasteful number, since it uses less digits than its factorization.

21104968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17628 (or 17624 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 21104968 is about 4594.0143665426. The cubic root of 21104968 is about 276.3513344174.

The spelling of 21104968 in words is "twenty-one million, one hundred four thousand, nine hundred sixty-eight".