131313311312221 has 4 divisors (see below), whose sum is σ = 131317953191100. Its totient is φ = 131308669433344.

The previous prime is 131313311312203. The next prime is 131313311312257. The reversal of 131313311312221 is 122213113313131.

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 61283376856900 + 70029934455321 = 7828370^2 + 8368389^2 .

It is a cyclic number.

It is not a de Polignac number, because 131313311312221 - 2⁵ = 131313311312189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131313311312221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131313311312321) 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, 2320897006 + ... + 2320953583.

It is an arithmetic number, because the mean of its divisors is an integer number (32829488297775).

Almost surely, 2^{131313311312221} is an apocalyptic number.

It is an amenable number.

131313311312221 is a deficient number, since it is larger than the sum of its proper divisors (4641878879).

131313311312221 is an equidigital number, since it uses as much as digits as its factorization.

131313311312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4641878878.

The product of its digits is 1944, while the sum is 28.

Adding to 131313311312221 its reverse (122213113313131), we get a palindrome (253526424625352).

The spelling of 131313311312221 in words is "one hundred thirty-one trillion, three hundred thirteen billion, three hundred eleven million, three hundred twelve thousand, two hundred twenty-one".