21757516676 has 12 divisors (see below), whose sum is σ = 43515033408. Its totient is φ = 9324649992.

The previous prime is 21757516673. The next prime is 21757516681. The reversal of 21757516676 is 67661575712.

21757516676 is an admirable number.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21757516673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388527056 + ... + 388527111.

It is an arithmetic number, because the mean of its divisors is an integer number (3626252784).

Almost surely, 2^21757516676 is an apocalyptic number.

It is an amenable number.

21757516676 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21757516676 is a wasteful number, since it uses less digits than its factorization.

21757516676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777054178 (or 777054176 counting only the distinct ones).

The product of its digits is 3704400, while the sum is 53.

The spelling of 21757516676 in words is "twenty-one billion, seven hundred fifty-seven million, five hundred sixteen thousand, six hundred seventy-six".