121606115751 has 40 divisors (see below), whose sum is σ = 184459088880. Its totient is φ = 79822081152.

The previous prime is 121606115731. The next prime is 121606115797. The reversal of 121606115751 is 157511606121.

121606115751 is a `hidden beast` number, since 1 + 21 + 6 + 0 + 61 + 1 + 575 + 1 = 666.

It is not a de Polignac number, because 121606115751 - 2¹⁰ = 121606114727 is a prime.

It is a super-2 number, since 2×121606115751² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121606115731) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 15066745 + ... + 15074813.

It is an arithmetic number, because the mean of its divisors is an integer number (4611477222).

Almost surely, 2^121606115751 is an apocalyptic number.

121606115751 is a deficient number, since it is larger than the sum of its proper divisors (62852973129).

121606115751 is an equidigital number, since it uses as much as digits as its factorization.

121606115751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10925 (or 10916 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 36.

The spelling of 121606115751 in words is "one hundred twenty-one billion, six hundred six million, one hundred fifteen thousand, seven hundred fifty-one".