921612111121 has 16 divisors (see below), whose sum is σ = 1011309609744. Its totient is φ = 834603404544.

The previous prime is 921612111113. The next prime is 921612111127. The reversal of 921612111121 is 121111216129.

It can be written as a sum of positive squares in 8 ways, for example, as 327847856400 + 593764254721 = 572580^2 + 770561^2 .

It is not a de Polignac number, because 921612111121 - 2³ = 921612111113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 921612111121.

It is not an unprimeable number, because it can be changed into a prime (921612111127) 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, 10482075 + ... + 10569631.

It is an arithmetic number, because the mean of its divisors is an integer number (63206850609).

Almost surely, 2^921612111121 is an apocalyptic number.

It is an amenable number.

921612111121 is a deficient number, since it is larger than the sum of its proper divisors (89697498623).

921612111121 is a wasteful number, since it uses less digits than its factorization.

921612111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102900.

The product of its digits is 432, while the sum is 28.

The spelling of 921612111121 in words is "nine hundred twenty-one billion, six hundred twelve million, one hundred eleven thousand, one hundred twenty-one".