31312232321 has 16 divisors (see below), whose sum is σ = 32517676800. Its totient is φ = 30115411200.

The previous prime is 31312232311. The next prime is 31312232339. The reversal of 31312232321 is 12323221313.

It is a cyclic number.

It is not a de Polignac number, because 31312232321 - 2⁶ = 31312232257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31312232311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10135145 + ... + 10138233.

It is an arithmetic number, because the mean of its divisors is an integer number (2032354800).

Almost surely, 2^31312232321 is an apocalyptic number.

It is an amenable number.

31312232321 is a deficient number, since it is larger than the sum of its proper divisors (1205444479).

31312232321 is a wasteful number, since it uses less digits than its factorization.

31312232321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4360.

The product of its digits is 1296, while the sum is 23.

Adding to 31312232321 its reverse (12323221313), we get a palindrome (43635453634).

The spelling of 31312232321 in words is "thirty-one billion, three hundred twelve million, two hundred thirty-two thousand, three hundred twenty-one".