21902066855055 has 48 divisors (see below), whose sum is σ = 38692916982720. Its totient is φ = 11456840338944.

The previous prime is 21902066855047. The next prime is 21902066855099. The reversal of 21902066855055 is 55055866020912.

It is a happy number.

21902066855055 is a `hidden beast` number, since 2 + 1 + 9 + 0 + 20 + 6 + 68 + 550 + 5 + 5 = 666.

It is not a de Polignac number, because 21902066855055 - 2³ = 21902066855047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21902066854992 and 21902066855010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5534542 + ... + 8627588.

It is an arithmetic number, because the mean of its divisors is an integer number (806102437140).

Almost surely, 2^{21902066855055} is an apocalyptic number.

21902066855055 is a deficient number, since it is larger than the sum of its proper divisors (16790850127665).

21902066855055 is a wasteful number, since it uses less digits than its factorization.

21902066855055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096080 (or 3096077 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 54.

The spelling of 21902066855055 in words is "twenty-one trillion, nine hundred two billion, sixty-six million, eight hundred fifty-five thousand, fifty-five".