21616006868055 has 32 divisors (see below), whose sum is σ = 38537319222720. Its totient is φ = 11495878225920.

The previous prime is 21616006868047. The next prime is 21616006868111. The reversal of 21616006868055 is 55086860061612.

21616006868055 is a `hidden beast` number, since 21 + 6 + 1 + 600 + 6 + 8 + 6 + 8 + 0 + 5 + 5 = 666.

It is not a de Polignac number, because 21616006868055 - 2³ = 21616006868047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21616006867992 and 21616006868010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 226749186 + ... + 226844495.

It is an arithmetic number, because the mean of its divisors is an integer number (1204291225710).

Almost surely, 2^{21616006868055} is an apocalyptic number.

21616006868055 is a deficient number, since it is larger than the sum of its proper divisors (16921312354665).

21616006868055 is a wasteful number, since it uses less digits than its factorization.

21616006868055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453594048 (or 453594042 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 54.

The spelling of 21616006868055 in words is "twenty-one trillion, six hundred sixteen billion, six million, eight hundred sixty-eight thousand, fifty-five".