21113768 has 16 divisors (see below), whose sum is σ = 42633780. Its totient is φ = 9744768.

The previous prime is 21113723. The next prime is 21113773. The reversal of 21113768 is 86731112.

It can be written as a sum of positive squares in 2 ways, for example, as 16176484 + 4937284 = 4022^2 + 2222^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21113768.

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, 101405 + ... + 101612.

Almost surely, 2^21113768 is an apocalyptic number.

It is an amenable number.

21113768 is an abundant number, since it is smaller than the sum of its proper divisors (21520012).

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

21113768 is a wasteful number, since it uses less digits than its factorization.

21113768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203036 (or 203032 counting only the distinct ones).

The product of its digits is 2016, while the sum is 29.

The square root of 21113768 is about 4594.9720347354. The cubic root of 21113768 is about 276.3897385476.

The spelling of 21113768 in words is "twenty-one million, one hundred thirteen thousand, seven hundred sixty-eight".