31313311112121 has 16 divisors (see below), whose sum is σ = 43280231995584. Its totient is φ = 20121511351104.

The previous prime is 31313311112117. The next prime is 31313311112177. The reversal of 31313311112121 is 12121111331313.

It is not a de Polignac number, because 31313311112121 - 2² = 31313311112117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31313311112091 and 31313311112100.

It is not an unprimeable number, because it can be changed into a prime (31313311112021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1318221310 + ... + 1318245063.

It is an arithmetic number, because the mean of its divisors is an integer number (2705014499724).

Almost surely, 2^{31313311112121} is an apocalyptic number.

It is an amenable number.

31313311112121 is a deficient number, since it is larger than the sum of its proper divisors (11966920883463).

31313311112121 is a wasteful number, since it uses less digits than its factorization.

31313311112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636466520.

The product of its digits is 324, while the sum is 24.

Adding to 31313311112121 its reverse (12121111331313), we get a palindrome (43434422443434).

The spelling of 31313311112121 in words is "thirty-one trillion, three hundred thirteen billion, three hundred eleven million, one hundred twelve thousand, one hundred twenty-one".