21118717312054 has 8 divisors (see below), whose sum is σ = 31757073664968. Its totient is φ = 10533026090400.

The previous prime is 21118717312003. The next prime is 21118717312061. The reversal of 21118717312054 is 45021371781112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21118717312054.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13166281812 + ... + 13166283415.

It is an arithmetic number, because the mean of its divisors is an integer number (3969634208121).

Almost surely, 2^{21118717312054} is an apocalyptic number.

21118717312054 is a deficient number, since it is larger than the sum of its proper divisors (10638356352914).

21118717312054 is a wasteful number, since it uses less digits than its factorization.

21118717312054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26332565630.

The product of its (nonzero) digits is 94080, while the sum is 43.

The spelling of 21118717312054 in words is "twenty-one trillion, one hundred eighteen billion, seven hundred seventeen million, three hundred twelve thousand, fifty-four".