21767757672 has 32 divisors (see below), whose sum is σ = 54460483200. Its totient is φ = 7250440704.

The previous prime is 21767757667. The next prime is 21767757733. The reversal of 21767757672 is 27675776712.

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, 309897 + ... + 373592.

It is an arithmetic number, because the mean of its divisors is an integer number (1701890100).

Almost surely, 2^21767757672 is an apocalyptic number.

It is an amenable number.

21767757672 is an abundant number, since it is smaller than the sum of its proper divisors (32692725528).

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

21767757672 is a wasteful number, since it uses less digits than its factorization.

21767757672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684825 (or 684821 counting only the distinct ones).

The product of its digits is 12101040, while the sum is 57.

The spelling of 21767757672 in words is "twenty-one billion, seven hundred sixty-seven million, seven hundred fifty-seven thousand, six hundred seventy-two".