21932512 has 48 divisors (see below), whose sum is σ = 49714560. Its totient is φ = 9330048.

The previous prime is 21932507. The next prime is 21932543. The reversal of 21932512 is 21523912.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39823 + ... + 40369.

It is an arithmetic number, because the mean of its divisors is an integer number (1035720).

Almost surely, 2^21932512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21932512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24857280).

21932512 is an abundant number, since it is smaller than the sum of its proper divisors (27782048).

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

21932512 is a wasteful number, since it uses less digits than its factorization.

21932512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743 (or 735 counting only the distinct ones).

The product of its digits is 1080, while the sum is 25.

The square root of 21932512 is about 4683.2159890400. The cubic root of 21932512 is about 279.9171183261.

The spelling of 21932512 in words is "twenty-one million, nine hundred thirty-two thousand, five hundred twelve".