21920996268 has 72 divisors (see below), whose sum is σ = 55978125840. Its totient is φ = 7232388480.

The previous prime is 21920996249. The next prime is 21920996297. The reversal of 21920996268 is 86269902912.

It is a happy number.

21920996268 is a `hidden beast` number, since 2 + 1 + 9 + 2 + 0 + 9 + 9 + 626 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6889638 + ... + 6892818.

It is an arithmetic number, because the mean of its divisors is an integer number (777473970).

Almost surely, 2^21920996268 is an apocalyptic number.

It is an amenable number.

21920996268 is an abundant number, since it is smaller than the sum of its proper divisors (34057129572).

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

21920996268 is a wasteful number, since it uses less digits than its factorization.

21920996268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5087 (or 5082 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 21920996268 in words is "twenty-one billion, nine hundred twenty million, nine hundred ninety-six thousand, two hundred sixty-eight".