21068752 has 20 divisors (see below), whose sum is σ = 41817636. Its totient is φ = 10277120.

The previous prime is 21068741. The next prime is 21068807. The reversal of 21068752 is 25786012.

It can be written as a sum of positive squares in 2 ways, for example, as 602176 + 20466576 = 776^2 + 4524^2 .

It is a congruent number.

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, 15403 + ... + 16714.

Almost surely, 2^21068752 is an apocalyptic number.

It is an amenable number.

21068752 is a deficient number, since it is larger than the sum of its proper divisors (20748884).

21068752 is a wasteful number, since it uses less digits than its factorization.

21068752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32166 (or 32160 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 21068752 is about 4590.0710234157. The cubic root of 21068752 is about 276.1931714966.

The spelling of 21068752 in words is "twenty-one million, sixty-eight thousand, seven hundred fifty-two".