21900528 has 60 divisors (see below), whose sum is σ = 66011400. Its totient is φ = 6738048.

The previous prime is 21900523. The next prime is 21900533. The reversal of 21900528 is 82500912.

It is an interprime number because it is at equal distance from previous prime (21900523) and next prime (21900533).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21900523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3978 + ... + 7721.

It is an arithmetic number, because the mean of its divisors is an integer number (1100190).

Almost surely, 2^21900528 is an apocalyptic number.

It is an amenable number.

21900528 is an abundant number, since it is smaller than the sum of its proper divisors (44110872).

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

21900528 is a wasteful number, since it uses less digits than its factorization.

21900528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11726 (or 11717 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 21900528 is about 4679.7999957263. The cubic root of 21900528 is about 279.7809851948.

The spelling of 21900528 in words is "twenty-one million, nine hundred thousand, five hundred twenty-eight".