121649868753 has 32 divisors (see below), whose sum is σ = 186660864000. Its totient is φ = 69032186496.

The previous prime is 121649868737. The next prime is 121649868763. The reversal of 121649868753 is 357868946121.

It is a happy number.

It is not a de Polignac number, because 121649868753 - 2⁴ = 121649868737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121649868733) 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, 1821648 + ... + 1887246.

It is an arithmetic number, because the mean of its divisors is an integer number (5833152000).

Almost surely, 2^121649868753 is an apocalyptic number.

It is an amenable number.

121649868753 is a deficient number, since it is larger than the sum of its proper divisors (65010995247).

121649868753 is a wasteful number, since it uses less digits than its factorization.

121649868753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66221.

The product of its digits is 17418240, while the sum is 60.

The spelling of 121649868753 in words is "one hundred twenty-one billion, six hundred forty-nine million, eight hundred sixty-eight thousand, seven hundred fifty-three".