31312331120121 has 4 divisors (see below), whose sum is σ = 41749774826832. Its totient is φ = 20874887413412.

The previous prime is 31312331120107. The next prime is 31312331120233. The reversal of 31312331120121 is 12102113321313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31312331120121 - 2³⁵ = 31277971381753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31312331120091 and 31312331120100.

It is not an unprimeable number, because it can be changed into a prime (31312331120821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5218721853351 + ... + 5218721853356.

It is an arithmetic number, because the mean of its divisors is an integer number (10437443706708).

Almost surely, 2^{31312331120121} is an apocalyptic number.

It is an amenable number.

31312331120121 is a deficient number, since it is larger than the sum of its proper divisors (10437443706711).

31312331120121 is a wasteful number, since it uses less digits than its factorization.

31312331120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10437443706710.

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 31312331120121 its reverse (12102113321313), we get a palindrome (43414444441434).

The spelling of 31312331120121 in words is "thirty-one trillion, three hundred twelve billion, three hundred thirty-one million, one hundred twenty thousand, one hundred twenty-one".