21547688676 has 48 divisors (see below), whose sum is σ = 50783314176. Its totient is φ = 7110461344.

The previous prime is 21547688611. The next prime is 21547688731. The reversal of 21547688676 is 67688674512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2135395 + ... + 2145461.

It is an arithmetic number, because the mean of its divisors is an integer number (1057985712).

Almost surely, 2^21547688676 is an apocalyptic number.

It is an amenable number.

21547688676 is an abundant number, since it is smaller than the sum of its proper divisors (29235625500).

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

21547688676 is a wasteful number, since it uses less digits than its factorization.

21547688676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11848 (or 11846 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 60.

The spelling of 21547688676 in words is "twenty-one billion, five hundred forty-seven million, six hundred eighty-eight thousand, six hundred seventy-six".