131322102221 has 2 divisors, whose sum is σ = 131322102222. Its totient is φ = 131322102220.

The previous prime is 131322102217. The next prime is 131322102253. The reversal of 131322102221 is 122201223131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130238704996 + 1083397225 = 360886^2 + 32915^2 .

It is a cyclic number.

It is not a de Polignac number, because 131322102221 - 2² = 131322102217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 131322102193 and 131322102202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131322102721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65661051110 + 65661051111.

It is an arithmetic number, because the mean of its divisors is an integer number (65661051111).

Almost surely, 2^131322102221 is an apocalyptic number.

It is an amenable number.

131322102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

131322102221 is an equidigital number, since it uses as much as digits as its factorization.

131322102221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 131322102221 its reverse (122201223131), we get a palindrome (253523325352).

The spelling of 131322102221 in words is "one hundred thirty-one billion, three hundred twenty-two million, one hundred two thousand, two hundred twenty-one".