21048868 has 6 divisors (see below), whose sum is σ = 36835526. Its totient is φ = 10524432.

The previous prime is 21048857. The next prime is 21048889. The reversal of 21048868 is 86884012.

It can be written as a sum of positive squares in only one way, i.e., 13823524 + 7225344 = 3718^2 + 2688^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2631105 + ... + 2631112.

Almost surely, 2^21048868 is an apocalyptic number.

It is an amenable number.

21048868 is a deficient number, since it is larger than the sum of its proper divisors (15786658).

21048868 is a wasteful number, since it uses less digits than its factorization.

21048868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5262221 (or 5262219 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 21048868 is about 4587.9045325726. The cubic root of 21048868 is about 276.1062567837.

The spelling of 21048868 in words is "twenty-one million, forty-eight thousand, eight hundred sixty-eight".