231021231313 has 4 divisors (see below), whose sum is σ = 231759318628. Its totient is φ = 230283144000.

The previous prime is 231021231269. The next prime is 231021231347. The reversal of 231021231313 is 313132120132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2553483024 + 228467748289 = 50532^2 + 477983^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231021231313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231021231113) 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, 369043188 + ... + 369043813.

It is an arithmetic number, because the mean of its divisors is an integer number (57939829657).

Almost surely, 2^231021231313 is an apocalyptic number.

It is an amenable number.

231021231313 is a deficient number, since it is larger than the sum of its proper divisors (738087315).

231021231313 is an equidigital number, since it uses as much as digits as its factorization.

231021231313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738087314.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 231021231313 its reverse (313132120132), we get a palindrome (544153351445).

The spelling of 231021231313 in words is "two hundred thirty-one billion, twenty-one million, two hundred thirty-one thousand, three hundred thirteen".