231321320013 has 32 divisors (see below), whose sum is σ = 353333320704. Its totient is φ = 131867551872.

The previous prime is 231321320003. The next prime is 231321320033. The reversal of 231321320013 is 310023123132.

It is not a de Polignac number, because 231321320013 - 2⁵ = 231321319981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231321320003) 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 31 ways as a sum of consecutive naturals, for example, 20543481 + ... + 20554737.

It is an arithmetic number, because the mean of its divisors is an integer number (11041666272).

Almost surely, 2^231321320013 is an apocalyptic number.

It is an amenable number.

231321320013 is a deficient number, since it is larger than the sum of its proper divisors (122012000691).

231321320013 is a wasteful number, since it uses less digits than its factorization.

231321320013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13521.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 231321320013 its reverse (310023123132), we get a palindrome (541344443145).

The spelling of 231321320013 in words is "two hundred thirty-one billion, three hundred twenty-one million, three hundred twenty thousand, thirteen".