31211313213 has 4 divisors (see below), whose sum is σ = 41615084288. Its totient is φ = 20807542140.

The previous prime is 31211313179. The next prime is 31211313229. The reversal of 31211313213 is 31231311213.

It is a happy number.

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 not a de Polignac number, because 31211313213 - 2¹⁶ = 31211247677 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31211313213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31211313233) 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, 5201885533 + ... + 5201885538.

It is an arithmetic number, because the mean of its divisors is an integer number (10403771072).

Almost surely, 2^31211313213 is an apocalyptic number.

It is an amenable number.

31211313213 is a deficient number, since it is larger than the sum of its proper divisors (10403771075).

31211313213 is a wasteful number, since it uses less digits than its factorization.

31211313213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10403771074.

The product of its digits is 324, while the sum is 21.

Adding to 31211313213 its reverse (31231311213), we get a palindrome (62442624426).

The spelling of 31211313213 in words is "thirty-one billion, two hundred eleven million, three hundred thirteen thousand, two hundred thirteen".