21880364 has 12 divisors (see below), whose sum is σ = 41771688. Its totient is φ = 9945600.

The previous prime is 21880321. The next prime is 21880367. The reversal of 21880364 is 46308812.

It is a self number, because there is not a number n which added to its sum of digits gives 21880364.

It is not an unprimeable number, because it can be changed into a prime (21880367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248597 + ... + 248684.

It is an arithmetic number, because the mean of its divisors is an integer number (3480974).

Almost surely, 2^21880364 is an apocalyptic number.

It is an amenable number.

21880364 is a deficient number, since it is larger than the sum of its proper divisors (19891324).

21880364 is a wasteful number, since it uses less digits than its factorization.

21880364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497296 (or 497294 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 21880364 is about 4677.6451340391. The cubic root of 21880364 is about 279.6950932616.

The spelling of 21880364 in words is "twenty-one million, eight hundred eighty thousand, three hundred sixty-four".