121688007189 has 16 divisors (see below), whose sum is σ = 187229632512. Its totient is φ = 68860896048.

The previous prime is 121688007187. The next prime is 121688007193. The reversal of 121688007189 is 981700886121.

It is a happy number.

It is not a de Polignac number, because 121688007189 - 2¹ = 121688007187 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121688007187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28127289 + ... + 28131614.

It is an arithmetic number, because the mean of its divisors is an integer number (11701852032).

Almost surely, 2^121688007189 is an apocalyptic number.

It is an amenable number.

121688007189 is a deficient number, since it is larger than the sum of its proper divisors (65541625323).

121688007189 is a wasteful number, since it uses less digits than its factorization.

121688007189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56259016.

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

The spelling of 121688007189 in words is "one hundred twenty-one billion, six hundred eighty-eight million, seven thousand, one hundred eighty-nine".