31312222321213 has 4 divisors (see below), whose sum is σ = 31314328208860. Its totient is φ = 31310116433568.

The previous prime is 31312222321207. The next prime is 31312222321253. The reversal of 31312222321213 is 31212322221313.

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 13830232085604 + 17481990235609 = 3718902^2 + 4181147^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31312222321213 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 (31312222321253) 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, 1052921520 + ... + 1052951257.

It is an arithmetic number, because the mean of its divisors is an integer number (7828582052215).

Almost surely, 2^{31312222321213} is an apocalyptic number.

It is an amenable number.

31312222321213 is a deficient number, since it is larger than the sum of its proper divisors (2105887647).

31312222321213 is a wasteful number, since it uses less digits than its factorization.

31312222321213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105887646.

The product of its digits is 5184, while the sum is 28.

Adding to 31312222321213 its reverse (31212322221313), we get a palindrome (62524544542526).

The spelling of 31312222321213 in words is "thirty-one trillion, three hundred twelve billion, two hundred twenty-two million, three hundred twenty-one thousand, two hundred thirteen".