31112321321 has 4 divisors (see below), whose sum is σ = 31218507012. Its totient is φ = 31006135632.

The previous prime is 31112321309. The next prime is 31112321323. The reversal of 31112321321 is 12312321113.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20239045696 + 10873275625 = 142264^2 + 104275^2 .

It is a cyclic number.

It is not a de Polignac number, because 31112321321 - 2⁶ = 31112321257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31112321293 and 31112321302.

It is not an unprimeable number, because it can be changed into a prime (31112321323) 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, 53092406 + ... + 53092991.

It is an arithmetic number, because the mean of its divisors is an integer number (7804626753).

Almost surely, 2^31112321321 is an apocalyptic number.

It is an amenable number.

31112321321 is a deficient number, since it is larger than the sum of its proper divisors (106185691).

31112321321 is a wasteful number, since it uses less digits than its factorization.

31112321321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106185690.

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

Adding to 31112321321 its reverse (12312321113), we get a palindrome (43424642434).

The spelling of 31112321321 in words is "thirty-one billion, one hundred twelve million, three hundred twenty-one thousand, three hundred twenty-one".