201231311323213 has 4 divisors (see below), whose sum is σ = 213068447283420. Its totient is φ = 189394175363008.

The previous prime is 201231311323183. The next prime is 201231311323253. The reversal of 201231311323213 is 312323113132102.

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 147694388149764 + 53536923173449 = 12152958^2 + 7316893^2 .

It is a cyclic number.

It is not a de Polignac number, because 201231311323213 - 2⁴⁵ = 166046939234381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201231311323253) 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 3 ways as a sum of consecutive naturals, for example, 5918567980078 + ... + 5918567980111.

It is an arithmetic number, because the mean of its divisors is an integer number (53267111820855).

Almost surely, 2^{201231311323213} is an apocalyptic number.

It is an amenable number.

201231311323213 is a deficient number, since it is larger than the sum of its proper divisors (11837135960207).

201231311323213 is a wasteful number, since it uses less digits than its factorization.

201231311323213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11837135960206.

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 201231311323213 its reverse (312323113132102), we get a palindrome (513554424455315).

The spelling of 201231311323213 in words is "two hundred one trillion, two hundred thirty-one billion, three hundred eleven million, three hundred twenty-three thousand, two hundred thirteen".