21927292 has 48 divisors (see below), whose sum is σ = 42900480. Its totient is φ = 9763200.

The previous prime is 21927281. The next prime is 21927293. The reversal of 21927292 is 29272912.

It is a super-2 number, since 2×21927292² = 961612268906528, which contains 22 as substring.

It is a Smith number, since the sum of its digits (34) 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 (21927293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96483 + ... + 96709.

It is an arithmetic number, because the mean of its divisors is an integer number (893760).

Almost surely, 2^21927292 is an apocalyptic number.

It is an amenable number.

21927292 is a deficient number, since it is larger than the sum of its proper divisors (20973188).

21927292 is a wasteful number, since it uses less digits than its factorization.

21927292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 320 counting only the distinct ones).

The product of its digits is 9072, while the sum is 34.

The square root of 21927292 is about 4682.6586465383. The cubic root of 21927292 is about 279.8949095417.

The spelling of 21927292 in words is "twenty-one million, nine hundred twenty-seven thousand, two hundred ninety-two".