121765124157 has 32 divisors (see below), whose sum is σ = 167208572160. Its totient is φ = 78771264000.

The previous prime is 121765124081. The next prime is 121765124177. The reversal of 121765124157 is 751421567121.

It is not a de Polignac number, because 121765124157 - 2¹⁰ = 121765123133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121765124177) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42558907 + ... + 42561767.

It is an arithmetic number, because the mean of its divisors is an integer number (5225267880).

Almost surely, 2^121765124157 is an apocalyptic number.

It is an amenable number.

121765124157 is a deficient number, since it is larger than the sum of its proper divisors (45443448003).

121765124157 is a wasteful number, since it uses less digits than its factorization.

121765124157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4645.

The product of its digits is 117600, while the sum is 42.

The spelling of 121765124157 in words is "one hundred twenty-one billion, seven hundred sixty-five million, one hundred twenty-four thousand, one hundred fifty-seven".