21901712 has 40 divisors (see below), whose sum is σ = 51353856. Its totient is φ = 8833536.

The previous prime is 21901709. The next prime is 21901739. The reversal of 21901712 is 21710912.

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, 3848 + ... + 7655.

Almost surely, 2^21901712 is an apocalyptic number.

It is an amenable number.

21901712 is an abundant number, since it is smaller than the sum of its proper divisors (29452144).

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

21901712 is a wasteful number, since it uses less digits than its factorization.

21901712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11535 (or 11529 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 21901712 is about 4679.9264951493. The cubic root of 21901712 is about 279.7860270020.

The spelling of 21901712 in words is "twenty-one million, nine hundred one thousand, seven hundred twelve".