31311331321 has 8 divisors (see below), whose sum is σ = 31372387200. Its totient is φ = 31250306400.

The previous prime is 31311331307. The next prime is 31311331351. The reversal of 31311331321 is 12313311313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31311331321 - 2⁷ = 31311331193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31311331292 and 31311331301.

It is not an unprimeable number, because it can be changed into a prime (31311331351) 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 7 ways as a sum of consecutive naturals, for example, 3384420 + ... + 3393658.

It is an arithmetic number, because the mean of its divisors is an integer number (3921548400).

Almost surely, 2^31311331321 is an apocalyptic number.

It is an amenable number.

31311331321 is a deficient number, since it is larger than the sum of its proper divisors (61055879).

31311331321 is an equidigital number, since it uses as much as digits as its factorization.

31311331321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15479.

The product of its digits is 486, while the sum is 22.

Adding to 31311331321 its reverse (12313311313), we get a palindrome (43624642634).

The spelling of 31311331321 in words is "thirty-one billion, three hundred eleven million, three hundred thirty-one thousand, three hundred twenty-one".