21117848805054 has 12 divisors (see below), whose sum is σ = 45755339077656. Its totient is φ = 7039282935012.

The previous prime is 21117848805041. The next prime is 21117848805071. The reversal of 21117848805054 is 45050884871112.

21117848805054 is a `hidden beast` number, since 2 + 1 + 1 + 17 + 8 + 48 + 80 + 505 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586606911234 + ... + 586606911269.

It is an arithmetic number, because the mean of its divisors is an integer number (3812944923138).

Almost surely, 2^{21117848805054} is an apocalyptic number.

21117848805054 is an abundant number, since it is smaller than the sum of its proper divisors (24637490272602).

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

21117848805054 is a wasteful number, since it uses less digits than its factorization.

21117848805054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173213822511 (or 1173213822508 counting only the distinct ones).

The product of its (nonzero) digits is 2867200, while the sum is 54.

The spelling of 21117848805054 in words is "twenty-one trillion, one hundred seventeen billion, eight hundred forty-eight million, eight hundred five thousand, fifty-four".