21227492 has 96 divisors (see below), whose sum is σ = 48263040. Its totient is φ = 8017920.

The previous prime is 21227477. The next prime is 21227501. The reversal of 21227492 is 29472212.

It is a super-2 number, since 2×21227492² = 901212833220128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 359759 + ... + 359817.

It is an arithmetic number, because the mean of its divisors is an integer number (502740).

Almost surely, 2^21227492 is an apocalyptic number.

21227492 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21227492 is an abundant number, since it is smaller than the sum of its proper divisors (27035548).

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

21227492 is a wasteful number, since it uses less digits than its factorization.

21227492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 139 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 21227492 is about 4607.3302464660. The cubic root of 21227492 is about 276.8850848560.

The spelling of 21227492 in words is "twenty-one million, two hundred twenty-seven thousand, four hundred ninety-two".