21107968 has 36 divisors (see below), whose sum is σ = 48156640. Its totient is φ = 9045504.

The previous prime is 21107953. The next prime is 21107981. The reversal of 21107968 is 86970112.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4098 + ... + 7681.

Almost surely, 2^21107968 is an apocalyptic number.

21107968 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21107968 is an abundant number, since it is smaller than the sum of its proper divisors (27048672).

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

21107968 is an equidigital number, since it uses as much as digits as its factorization.

21107968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11802 (or 11788 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 21107968 is about 4594.3408667621. The cubic root of 21107968 is about 276.3644279336.

The spelling of 21107968 in words is "twenty-one million, one hundred seven thousand, nine hundred sixty-eight".