31113232321 has 4 divisors (see below), whose sum is σ = 31154662144. Its totient is φ = 31071802500.

The previous prime is 31113232303. The next prime is 31113232331. The reversal of 31113232321 is 12323231113.

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 31113232321 - 2⁵ = 31113232289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31113232292 and 31113232301.

It is not an unprimeable number, because it can be changed into a prime (31113232331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20713785 + ... + 20715286.

It is an arithmetic number, because the mean of its divisors is an integer number (7788665536).

Almost surely, 2^31113232321 is an apocalyptic number.

It is an amenable number.

31113232321 is a deficient number, since it is larger than the sum of its proper divisors (41429823).

31113232321 is an equidigital number, since it uses as much as digits as its factorization.

31113232321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41429822.

The product of its digits is 648, while the sum is 22.

Adding to 31113232321 its reverse (12323231113), we get a palindrome (43436463434).

The spelling of 31113232321 in words is "thirty-one billion, one hundred thirteen million, two hundred thirty-two thousand, three hundred twenty-one".