21927392 has 12 divisors (see below), whose sum is σ = 43169616. Its totient is φ = 10963680.

The previous prime is 21927391. The next prime is 21927407. The reversal of 21927392 is 29372912.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21927391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342584 + ... + 342647.

It is an arithmetic number, because the mean of its divisors is an integer number (3597468).

Almost surely, 2^21927392 is an apocalyptic number.

It is an amenable number.

21927392 is a deficient number, since it is larger than the sum of its proper divisors (21242224).

21927392 is an equidigital number, since it uses as much as digits as its factorization.

21927392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685241 (or 685233 counting only the distinct ones).

The product of its digits is 13608, while the sum is 35.

The square root of 21927392 is about 4682.6693242210. The cubic root of 21927392 is about 279.8953350304.

The spelling of 21927392 in words is "twenty-one million, nine hundred twenty-seven thousand, three hundred ninety-two".