131303232312221 has 4 divisors (see below), whose sum is σ = 131655251702172. Its totient is φ = 130951212922272.

The previous prime is 131303232312181. The next prime is 131303232312229. The reversal of 131303232312221 is 122213232303131.

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 52028248989721 + 79274983322500 = 7213061^2 + 8903650^2 .

It is a cyclic number.

It is not a de Polignac number, because 131303232312221 - 2¹⁸ = 131303232050077 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 (131303232312229) 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, 176009694416 + ... + 176009695161.

It is an arithmetic number, because the mean of its divisors is an integer number (32913812925543).

Almost surely, 2^{131303232312221} is an apocalyptic number.

It is an amenable number.

131303232312221 is a deficient number, since it is larger than the sum of its proper divisors (352019389951).

131303232312221 is an equidigital number, since it uses as much as digits as its factorization.

131303232312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352019389950.

The product of its (nonzero) digits is 7776, while the sum is 29.

Adding to 131303232312221 its reverse (122213232303131), we get a palindrome (253516464615352).

The spelling of 131303232312221 in words is "one hundred thirty-one trillion, three hundred three billion, two hundred thirty-two million, three hundred twelve thousand, two hundred twenty-one".