21044752 has 10 divisors (see below), whose sum is σ = 40774238. Its totient is φ = 10522368.

The previous prime is 21044743. The next prime is 21044773. The reversal of 21044752 is 25744012.

It can be written as a sum of positive squares in only one way, i.e., 20939776 + 104976 = 4576^2 + 324^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657633 + ... + 657664.

Almost surely, 2^21044752 is an apocalyptic number.

It is an amenable number.

21044752 is a deficient number, since it is larger than the sum of its proper divisors (19729486).

21044752 is a wasteful number, since it uses less digits than its factorization.

21044752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315305 (or 1315299 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 21044752 is about 4587.4559398429. The cubic root of 21044752 is about 276.0882585484.

Adding to 21044752 its reverse (25744012), we get a palindrome (46788764).

The spelling of 21044752 in words is "twenty-one million, forty-four thousand, seven hundred fifty-two".