21088752 has 20 divisors (see below), whose sum is σ = 54479400. Its totient is φ = 7029568.

The previous prime is 21088747. The next prime is 21088763. The reversal of 21088752 is 25788012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219627 + ... + 219722.

It is an arithmetic number, because the mean of its divisors is an integer number (2723970).

Almost surely, 2^21088752 is an apocalyptic number.

It is an amenable number.

21088752 is an abundant number, since it is smaller than the sum of its proper divisors (33390648).

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

21088752 is a wasteful number, since it uses less digits than its factorization.

21088752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439360 (or 439354 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 21088752 is about 4592.2491221623. The cubic root of 21088752 is about 276.2805381090.

The spelling of 21088752 in words is "twenty-one million, eighty-eight thousand, seven hundred fifty-two".