21075752 has 16 divisors (see below), whose sum is σ = 39784500. Its totient is φ = 10466560.

The previous prime is 21075749. The next prime is 21075773. The reversal of 21075752 is 25757012.

It can be written as a sum of positive squares in 2 ways, for example, as 18783556 + 2292196 = 4334^2 + 1514^2 .

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, 7649 + ... + 10032.

Almost surely, 2^21075752 is an apocalyptic number.

It is an amenable number.

21075752 is a deficient number, since it is larger than the sum of its proper divisors (18708748).

21075752 is a wasteful number, since it uses less digits than its factorization.

21075752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17836 (or 17832 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 21075752 is about 4590.8334755249. The cubic root of 21075752 is about 276.2237560977.

The spelling of 21075752 in words is "twenty-one million, seventy-five thousand, seven hundred fifty-two".