31112321213 has 16 divisors (see below), whose sum is σ = 31876955136. Its totient is φ = 30357452160.

The previous prime is 31112321117. The next prime is 31112321257. The reversal of 31112321213 is 31212321113.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 31112321213 - 2¹⁶ = 31112255677 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31112321263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12006548 + ... + 12009138.

It is an arithmetic number, because the mean of its divisors is an integer number (1992309696).

Almost surely, 2^31112321213 is an apocalyptic number.

It is an amenable number.

31112321213 is a deficient number, since it is larger than the sum of its proper divisors (764633923).

31112321213 is a wasteful number, since it uses less digits than its factorization.

31112321213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4364.

The product of its digits is 216, while the sum is 20.

Adding to 31112321213 its reverse (31212321113), we get a palindrome (62324642326).

The spelling of 31112321213 in words is "thirty-one billion, one hundred twelve million, three hundred twenty-one thousand, two hundred thirteen".