121862691939 has 16 divisors (see below), whose sum is σ = 172186146720. Its totient is φ = 76527171840.

The previous prime is 121862691911. The next prime is 121862691961. The reversal of 121862691939 is 939196268121.

It is not a de Polignac number, because 121862691939 - 2⁹ = 121862691427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121862191939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17078392 + ... + 17085525.

It is an arithmetic number, because the mean of its divisors is an integer number (10761634170).

Almost surely, 2^121862691939 is an apocalyptic number.

121862691939 is a deficient number, since it is larger than the sum of its proper divisors (50323454781).

121862691939 is a wasteful number, since it uses less digits than its factorization.

121862691939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34163990.

The product of its digits is 2519424, while the sum is 57.

The spelling of 121862691939 in words is "one hundred twenty-one billion, eight hundred sixty-two million, six hundred ninety-one thousand, nine hundred thirty-nine".