21812960 has 48 divisors (see below), whose sum is σ = 55502496. Its totient is φ = 8053248.

The previous prime is 21812953. The next prime is 21812977. The reversal of 21812960 is 6921812.

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, 3164 + ... + 7323.

It is an arithmetic number, because the mean of its divisors is an integer number (1156302).

Almost surely, 2^21812960 is an apocalyptic number.

21812960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21812960 is an abundant number, since it is smaller than the sum of its proper divisors (33689536).

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

21812960 is a wasteful number, since it uses less digits than its factorization.

21812960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10515 (or 10507 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 21812960 is about 4670.4346692787. The cubic root of 21812960 is about 279.4075910343.

The spelling of 21812960 in words is "twenty-one million, eight hundred twelve thousand, nine hundred sixty".