21880264 has 24 divisors (see below), whose sum is σ = 47724390. Its totient is φ = 9377088.

The previous prime is 21880259. The next prime is 21880277. The reversal of 21880264 is 46208812.

It can be written as a sum of positive squares in only one way, i.e., 11957764 + 9922500 = 3458^2 + 3150^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27517 + ... + 28300.

Almost surely, 2^21880264 is an apocalyptic number.

It is an amenable number.

21880264 is an abundant number, since it is smaller than the sum of its proper divisors (25844126).

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

21880264 is a wasteful number, since it uses less digits than its factorization.

21880264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55837 (or 55826 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 21880264 is about 4677.6344448877. The cubic root of 21880264 is about 279.6946671634.

The spelling of 21880264 in words is "twenty-one million, eight hundred eighty thousand, two hundred sixty-four".