31311211223321 has 16 divisors (see below), whose sum is σ = 33496514827776. Its totient is φ = 29164101236736.

The previous prime is 31311211223309. The next prime is 31311211223333. The reversal of 31311211223321 is 12332211211313.

It is an interprime number because it is at equal distance from previous prime (31311211223309) and next prime (31311211223333).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31311211223321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31311211223381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33052160 + ... + 33986286.

It is an arithmetic number, because the mean of its divisors is an integer number (2093532176736).

Almost surely, 2^{31311211223321} is an apocalyptic number.

It is an amenable number.

31311211223321 is a deficient number, since it is larger than the sum of its proper divisors (2185303604455).

31311211223321 is a wasteful number, since it uses less digits than its factorization.

31311211223321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954568.

The product of its digits is 1296, while the sum is 26.

Adding to 31311211223321 its reverse (12332211211313), we get a palindrome (43643422434634).

The spelling of 31311211223321 in words is "thirty-one trillion, three hundred eleven billion, two hundred eleven million, two hundred twenty-three thousand, three hundred twenty-one".