21694884976 has 80 divisors (see below), whose sum is σ = 43668455040. Its totient is φ = 10433986560.

The previous prime is 21694884973. The next prime is 21694885001. The reversal of 21694884976 is 67948849612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21694884971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23352480 + ... + 23353408.

It is an arithmetic number, because the mean of its divisors is an integer number (545855688).

Almost surely, 2^21694884976 is an apocalyptic number.

It is an amenable number.

21694884976 is an abundant number, since it is smaller than the sum of its proper divisors (21973570064).

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

21694884976 is a wasteful number, since it uses less digits than its factorization.

21694884976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442 (or 1436 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 64.

The spelling of 21694884976 in words is "twenty-one billion, six hundred ninety-four million, eight hundred eighty-four thousand, nine hundred seventy-six".