21924732 has 24 divisors (see below), whose sum is σ = 51359616. Its totient is φ = 7279408.

The previous prime is 21924731. The next prime is 21924733. The reversal of 21924732 is 23742912.

It is an interprime number because it is at equal distance from previous prime (21924731) and next prime (21924733).

It is a self number, because there is not a number n which added to its sum of digits gives 21924732.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21924731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318 + ... + 6629.

It is an arithmetic number, because the mean of its divisors is an integer number (2139984).

Almost surely, 2^21924732 is an apocalyptic number.

It is an amenable number.

21924732 is an abundant number, since it is smaller than the sum of its proper divisors (29434884).

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

21924732 is a wasteful number, since it uses less digits than its factorization.

21924732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7217 (or 7215 counting only the distinct ones).

The product of its digits is 6048, while the sum is 30.

The square root of 21924732 is about 4682.3852895720. The cubic root of 21924732 is about 279.8840165891.

The spelling of 21924732 in words is "twenty-one million, nine hundred twenty-four thousand, seven hundred thirty-two".