31213431321011 has 4 divisors (see below), whose sum is σ = 31535219272872. Its totient is φ = 30891643369152.

The previous prime is 31213431320999. The next prime is 31213431321031. The reversal of 31213431321011 is 11012313431213.

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

It is a cyclic number.

It is not a de Polignac number, because 31213431321011 - 2⁶ = 31213431320947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31213431321031) 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, 160893975785 + ... + 160893975978.

It is an arithmetic number, because the mean of its divisors is an integer number (7883804818218).

Almost surely, 2^{31213431321011} is an apocalyptic number.

31213431321011 is a deficient number, since it is larger than the sum of its proper divisors (321787951861).

31213431321011 is an equidigital number, since it uses as much as digits as its factorization.

31213431321011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321787951860.

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

Adding to 31213431321011 its reverse (11012313431213), we get a palindrome (42225744752224).

The spelling of 31213431321011 in words is "thirty-one trillion, two hundred thirteen billion, four hundred thirty-one million, three hundred twenty-one thousand, eleven".