21654112556 has 6 divisors (see below), whose sum is σ = 37894696980. Its totient is φ = 10827056276.

The previous prime is 21654112549. The next prime is 21654112583. The reversal of 21654112556 is 65521145612.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2706764066 + ... + 2706764073.

It is an arithmetic number, because the mean of its divisors is an integer number (6315782830).

Almost surely, 2^21654112556 is an apocalyptic number.

It is an amenable number.

21654112556 is a deficient number, since it is larger than the sum of its proper divisors (16240584424).

21654112556 is a wasteful number, since it uses less digits than its factorization.

21654112556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5413528143 (or 5413528141 counting only the distinct ones).

The product of its digits is 72000, while the sum is 38.

The spelling of 21654112556 in words is "twenty-one billion, six hundred fifty-four million, one hundred twelve thousand, five hundred fifty-six".