21043108 has 12 divisors (see below), whose sum is σ = 38763760. Its totient is φ = 9967752.

The previous prime is 21043097. The next prime is 21043111. The reversal of 21043108 is 80134012.

It is a Harshad number since it is a multiple of its sum of digits (19).

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, 138366 + ... + 138517.

Almost surely, 2^21043108 is an apocalyptic number.

It is an amenable number.

21043108 is a deficient number, since it is larger than the sum of its proper divisors (17720652).

21043108 is a wasteful number, since it uses less digits than its factorization.

21043108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276906 (or 276904 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21043108 is about 4587.2767520611. The cubic root of 21043108 is about 276.0810690930.

The spelling of 21043108 in words is "twenty-one million, forty-three thousand, one hundred eight".