31112133310221 has 4 divisors (see below), whose sum is σ = 41482844413632. Its totient is φ = 20741422206812.

The previous prime is 31112133310177. The next prime is 31112133310249. The reversal of 31112133310221 is 12201333121113.

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 31112133310221 - 2²⁶ = 31112066201357 is a prime.

It is a super-2 number, since 2×31112133310221² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31112133310191 and 31112133310200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31112143310221) 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, 5185355551701 + ... + 5185355551706.

It is an arithmetic number, because the mean of its divisors is an integer number (10370711103408).

Almost surely, 2^{31112133310221} is an apocalyptic number.

It is an amenable number.

31112133310221 is a deficient number, since it is larger than the sum of its proper divisors (10370711103411).

31112133310221 is a wasteful number, since it uses less digits than its factorization.

31112133310221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10370711103410.

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 31112133310221 its reverse (12201333121113), we get a palindrome (43313466431334).

The spelling of 31112133310221 in words is "thirty-one trillion, one hundred twelve billion, one hundred thirty-three million, three hundred ten thousand, two hundred twenty-one".