121938879192 has 128 divisors (see below), whose sum is σ = 339270543360. Its totient is φ = 36268277760.

The previous prime is 121938879187. The next prime is 121938879203. The reversal of 121938879192 is 291978839121.

It is a happy number.

It is a congruent 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, 9152728 + ... + 9166040.

It is an arithmetic number, because the mean of its divisors is an integer number (2650551120).

Almost surely, 2^121938879192 is an apocalyptic number.

121938879192 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121938879192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169635271680).

121938879192 is an abundant number, since it is smaller than the sum of its proper divisors (217331664168).

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

121938879192 is a wasteful number, since it uses less digits than its factorization.

121938879192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14313 (or 14309 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 60.

The spelling of 121938879192 in words is "one hundred twenty-one billion, nine hundred thirty-eight million, eight hundred seventy-nine thousand, one hundred ninety-two".