121317823218 has 64 divisors (see below), whose sum is σ = 265392433152. Its totient is φ = 36859912320.

The previous prime is 121317823183. The next prime is 121317823223. The reversal of 121317823218 is 812328713121.

It is a Curzon 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, 6030 + ... + 492617.

It is an arithmetic number, because the mean of its divisors is an integer number (4146756768).

Almost surely, 2^121317823218 is an apocalyptic number.

121317823218 is an abundant number, since it is smaller than the sum of its proper divisors (144074609934).

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

121317823218 is a wasteful number, since it uses less digits than its factorization.

121317823218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498759.

The product of its digits is 32256, while the sum is 39.

The spelling of 121317823218 in words is "one hundred twenty-one billion, three hundred seventeen million, eight hundred twenty-three thousand, two hundred eighteen".