121405189168 has 20 divisors (see below), whose sum is σ = 236939511240. Its totient is φ = 60259508864.

The previous prime is 121405189163. The next prime is 121405189187. The reversal of 121405189168 is 861981504121.

It is not an unprimeable number, because it can be changed into a prime (121405189163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27690598 + ... + 27694981.

It is an arithmetic number, because the mean of its divisors is an integer number (11846975562).

Almost surely, 2^121405189168 is an apocalyptic number.

It is an amenable number.

121405189168 is a deficient number, since it is larger than the sum of its proper divisors (115534322072).

121405189168 is a wasteful number, since it uses less digits than its factorization.

121405189168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55385724 (or 55385718 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 46.

The spelling of 121405189168 in words is "one hundred twenty-one billion, four hundred five million, one hundred eighty-nine thousand, one hundred sixty-eight".