21968758 has 12 divisors (see below), whose sum is σ = 38333412. Its totient is φ = 9415140.

The previous prime is 21968753. The next prime is 21968759. The reversal of 21968758 is 85786912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21968753) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111988 + ... + 112183.

It is an arithmetic number, because the mean of its divisors is an integer number (3194451).

Almost surely, 2^21968758 is an apocalyptic number.

21968758 is a deficient number, since it is larger than the sum of its proper divisors (16364654).

21968758 is a wasteful number, since it uses less digits than its factorization.

21968758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224187 (or 224180 counting only the distinct ones).

The product of its digits is 241920, while the sum is 46.

The square root of 21968758 is about 4687.0841682223. The cubic root of 21968758 is about 280.0712318771.

The spelling of 21968758 in words is "twenty-one million, nine hundred sixty-eight thousand, seven hundred fifty-eight".