31213244231213 has 4 divisors (see below), whose sum is σ = 34050811888608. Its totient is φ = 28375676573820.

The previous prime is 31213244231209. The next prime is 31213244231249.

31213244231213 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 31213244231213 - 2² = 31213244231209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31213244231213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213244201213) 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, 1418783828681 + ... + 1418783828702.

It is an arithmetic number, because the mean of its divisors is an integer number (8512702972152).

Almost surely, 2^{31213244231213} is an apocalyptic number.

It is an amenable number.

31213244231213 is a deficient number, since it is larger than the sum of its proper divisors (2837567657395).

31213244231213 is a wasteful number, since it uses less digits than its factorization.

31213244231213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2837567657394.

The product of its digits is 20736, while the sum is 32.

It can be divided in two parts, 3121324 and 4231213, that added together give a palindrome (7352537).

The spelling of 31213244231213 in words is "thirty-one trillion, two hundred thirteen billion, two hundred forty-four million, two hundred thirty-one thousand, two hundred thirteen".