121129388178 has 16 divisors (see below), whose sum is σ = 242881554240. Its totient is φ = 40272666416.

The previous prime is 121129388167. The next prime is 121129388209. The reversal of 121129388178 is 871883921121.

It is a self number, because there is not a number n which added to its sum of digits gives 121129388178.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25946550 + ... + 25951217.

It is an arithmetic number, because the mean of its divisors is an integer number (15180097140).

Almost surely, 2^121129388178 is an apocalyptic number.

121129388178 is an abundant number, since it is smaller than the sum of its proper divisors (121752166062).

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

121129388178 is a wasteful number, since it uses less digits than its factorization.

121129388178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51898161.

The product of its digits is 387072, while the sum is 51.

The spelling of 121129388178 in words is "one hundred twenty-one billion, one hundred twenty-nine million, three hundred eighty-eight thousand, one hundred seventy-eight".