21974080 has 28 divisors (see below), whose sum is σ = 52326540. Its totient is φ = 8789504.

The previous prime is 21974077. The next prime is 21974107. The reversal of 21974080 is 8047912.

It can be written as a sum of positive squares in 2 ways, for example, as 17239104 + 4734976 = 4152^2 + 2176^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34015 + ... + 34654.

It is an arithmetic number, because the mean of its divisors is an integer number (1868805).

Almost surely, 2^21974080 is an apocalyptic number.

21974080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21974080 is an abundant number, since it is smaller than the sum of its proper divisors (30352460).

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

21974080 is an equidigital number, since it uses as much as digits as its factorization.

21974080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68686 (or 68676 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 21974080 is about 4687.6518642066. The cubic root of 21974080 is about 280.0938460936.

The spelling of 21974080 in words is "twenty-one million, nine hundred seventy-four thousand, eighty".