121615265123 has 16 divisors (see below), whose sum is σ = 133552022400. Its totient is φ = 109825994880.

The previous prime is 121615265063. The next prime is 121615265171. The reversal of 121615265123 is 321562516121.

It is a cyclic number.

It is not a de Polignac number, because 121615265123 - 2¹⁸ = 121615002979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121615265423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3801368 + ... + 3833226.

It is an arithmetic number, because the mean of its divisors is an integer number (8347001400).

Almost surely, 2^121615265123 is an apocalyptic number.

121615265123 is a deficient number, since it is larger than the sum of its proper divisors (11936757277).

121615265123 is a wasteful number, since it uses less digits than its factorization.

121615265123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34162.

The product of its digits is 21600, while the sum is 35.

The spelling of 121615265123 in words is "one hundred twenty-one billion, six hundred fifteen million, two hundred sixty-five thousand, one hundred twenty-three".