21937392 has 50 divisors (see below), whose sum is σ = 63496928. Its totient is φ = 7312032.

The previous prime is 21937387. The next prime is 21937393. The reversal of 21937392 is 29373912.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21937393) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7168 + ... + 9759.

Almost surely, 2^21937392 is an apocalyptic number.

It is an amenable number.

21937392 is an abundant number, since it is smaller than the sum of its proper divisors (41559536).

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

21937392 is a wasteful number, since it uses less digits than its factorization.

21937392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16947 (or 16932 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 21937392 is about 4683.7369695575. The cubic root of 21937392 is about 279.9378773746.

The spelling of 21937392 in words is "twenty-one million, nine hundred thirty-seven thousand, three hundred ninety-two".