231313203221 has 8 divisors (see below), whose sum is σ = 244970046360. Its totient is φ = 217661936128.

The previous prime is 231313203197. The next prime is 231313203227. The reversal of 231313203221 is 122302313132.

It can be written as a sum of positive squares in 4 ways, for example, as 50144644900 + 181168558321 = 223930^2 + 425639^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231313203221 - 2⁶ = 231313203157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231313203227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1308446 + ... + 1474671.

It is an arithmetic number, because the mean of its divisors is an integer number (30621255795).

Almost surely, 2^231313203221 is an apocalyptic number.

It is an amenable number.

231313203221 is a deficient number, since it is larger than the sum of its proper divisors (13656843139).

231313203221 is a wasteful number, since it uses less digits than its factorization.

231313203221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2788023.

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

Adding to 231313203221 its reverse (122302313132), we get a palindrome (353615516353).

The spelling of 231313203221 in words is "two hundred thirty-one billion, three hundred thirteen million, two hundred three thousand, two hundred twenty-one".