31221111112213 has 24 divisors (see below), whose sum is σ = 37105900505856. Its totient is φ = 26021608171200.

The previous prime is 31221111112207. The next prime is 31221111112291.

31221111112213 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 31221111112213 - 2²⁵ = 31221077557781 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 (31221111112913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126687856 + ... + 126934057.

It is an arithmetic number, because the mean of its divisors is an integer number (1546079187744).

Almost surely, 2^{31221111112213} is an apocalyptic number.

It is an amenable number.

31221111112213 is a deficient number, since it is larger than the sum of its proper divisors (5884789393643).

31221111112213 is a wasteful number, since it uses less digits than its factorization.

31221111112213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253621993 (or 253621974 counting only the distinct ones).

The product of its digits is 144, while the sum is 22.

Multiplying 31221111112213 by its sum of digits (22), we get a palindrome (686864444468686).

It can be divided in two parts, 3122111 and 1112213, that added together give a palindrome (4234324).

The spelling of 31221111112213 in words is "thirty-one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred twelve thousand, two hundred thirteen".