21980264 has 32 divisors (see below), whose sum is σ = 44452800. Its totient is φ = 10154880.

The previous prime is 21980243. The next prime is 21980281. The reversal of 21980264 is 46208912.

It is a self number, because there is not a number n which added to its sum of digits gives 21980264.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4469 + ... + 7995.

It is an arithmetic number, because the mean of its divisors is an integer number (1389150).

Almost surely, 2^21980264 is an apocalyptic number.

It is an amenable number.

21980264 is an abundant number, since it is smaller than the sum of its proper divisors (22472536).

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

21980264 is a wasteful number, since it uses less digits than its factorization.

21980264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593 (or 3589 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 21980264 is about 4688.3114231032. The cubic root of 21980264 is about 280.1201185304.

The spelling of 21980264 in words is "twenty-one million, nine hundred eighty thousand, two hundred sixty-four".