121129312100 has 36 divisors (see below), whose sum is σ = 264741649200. Its totient is φ = 48103145760.

The previous prime is 121129312093. The next prime is 121129312133. The reversal of 121129312100 is 1213921121.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4343270 + ... + 4371069.

It is an arithmetic number, because the mean of its divisors is an integer number (7353934700).

Almost surely, 2^121129312100 is an apocalyptic number.

121129312100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121129312100 is an abundant number, since it is smaller than the sum of its proper divisors (143612337100).

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

121129312100 is a wasteful number, since it uses less digits than its factorization.

121129312100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8714492 (or 8714485 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 121129312100 in words is "one hundred twenty-one billion, one hundred twenty-nine million, three hundred twelve thousand, one hundred".