21924532 has 12 divisors (see below), whose sum is σ = 43849120. Its totient is φ = 9396216.

The previous prime is 21924523. The next prime is 21924541. The reversal of 21924532 is 23542912.

It is an interprime number because it is at equal distance from previous prime (21924523) and next prime (21924541).

21924532 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 783019 = 21924532 / (2 + 1 + 9 + 2 + 4 + 5 + 3 + 2).

It is a self number, because there is not a number n which added to its sum of digits gives 21924532.

It is a congruent number.

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, 391482 + ... + 391537.

Almost surely, 2^21924532 is an apocalyptic number.

It is an amenable number.

21924532 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21924532 is a wasteful number, since it uses less digits than its factorization.

21924532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783030 (or 783028 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 21924532 is about 4682.3639328869. The cubic root of 21924532 is about 279.8831655415.

It can be divided in two parts, 2192 and 4532, that added together give a square (6724 = 82²).

The spelling of 21924532 in words is "twenty-one million, nine hundred twenty-four thousand, five hundred thirty-two".