31013221213 has 4 divisors (see below), whose sum is σ = 33398853628. Its totient is φ = 28627588800.

The previous prime is 31013221207. The next prime is 31013221241. The reversal of 31013221213 is 31212231013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31212231013 = 17 ⋅1836013589.

It can be written as a sum of positive squares in 2 ways, for example, as 9994600729 + 21018620484 = 99973^2 + 144978^2 .

It is a cyclic number.

It is not a de Polignac number, because 31013221213 - 2²⁹ = 30476350301 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 (31013221913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1192816188 + ... + 1192816213.

It is an arithmetic number, because the mean of its divisors is an integer number (8349713407).

Almost surely, 2^31013221213 is an apocalyptic number.

It is an amenable number.

31013221213 is a deficient number, since it is larger than the sum of its proper divisors (2385632415).

31013221213 is a wasteful number, since it uses less digits than its factorization.

31013221213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2385632414.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31013221213 its reverse (31212231013), we get a palindrome (62225452226).

The spelling of 31013221213 in words is "thirty-one billion, thirteen million, two hundred twenty-one thousand, two hundred thirteen".