31211111111213 has 4 divisors (see below), whose sum is σ = 34048484848608. Its totient is φ = 28373737373820.

The previous prime is 31211111111179. The next prime is 31211111111227.

31211111111213 is nontrivially palindromic in base 10.

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 31211111111213 - 2²⁰ = 31211110062637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31211111117213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1418686868681 + ... + 1418686868702.

It is an arithmetic number, because the mean of its divisors is an integer number (8512121212152).

Almost surely, 2^{31211111111213} is an apocalyptic number.

It is an amenable number.

31211111111213 is a deficient number, since it is larger than the sum of its proper divisors (2837373737395).

31211111111213 is a wasteful number, since it uses less digits than its factorization.

31211111111213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2837373737394.

The product of its digits is 36, while the sum is 20.

It can be divided in two parts, 3121111 and 1111213, that added together give a palindrome (4232324).

The spelling of 31211111111213 in words is "thirty-one trillion, two hundred eleven billion, one hundred eleven million, one hundred eleven thousand, two hundred thirteen".