21122752 has 28 divisors (see below), whose sum is σ = 47904400. Its totient is φ = 9052416.

The previous prime is 21122743. The next prime is 21122821. The reversal of 21122752 is 25722112.

It is a tau number, because it is divible by the number of its divisors (28).

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, 23127 + ... + 24022.

Almost surely, 2^21122752 is an apocalyptic number.

It is an amenable number.

21122752 is an abundant number, since it is smaller than the sum of its proper divisors (26781648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21122752 is an equidigital number, since it uses as much as digits as its factorization.

21122752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47168 (or 47158 counting only the distinct ones).

The product of its digits is 560, while the sum is 22.

The square root of 21122752 is about 4595.9495210457. The cubic root of 21122752 is about 276.4289346668.

Adding to 21122752 its reverse (25722112), we get a palindrome (46844864).

The spelling of 21122752 in words is "twenty-one million, one hundred twenty-two thousand, seven hundred fifty-two".