3111331221121 has 4 divisors (see below), whose sum is σ = 3111359670100. Its totient is φ = 3111302772144.

The previous prime is 3111331221101. The next prime is 3111331221137. The reversal of 3111331221121 is 1211221331113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1257134288400 + 1854196932721 = 1121220^2 + 1361689^2 .

It is a cyclic number.

It is not a de Polignac number, because 3111331221121 - 2²⁷ = 3111197003393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3111331221092 and 3111331221101.

It is not an unprimeable number, because it can be changed into a prime (3111331221101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14059806 + ... + 14279383.

It is an arithmetic number, because the mean of its divisors is an integer number (777839917525).

Almost surely, 2^{3111331221121} is an apocalyptic number.

It is an amenable number.

3111331221121 is a deficient number, since it is larger than the sum of its proper divisors (28448979).

3111331221121 is a wasteful number, since it uses less digits than its factorization.

3111331221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28448978.

The product of its digits is 216, while the sum is 22.

Adding to 3111331221121 its reverse (1211221331113), we get a palindrome (4322552552234).

The spelling of 3111331221121 in words is "three trillion, one hundred eleven billion, three hundred thirty-one million, two hundred twenty-one thousand, one hundred twenty-one".