131311103225221 has 2 divisors, whose sum is σ = 131311103225222. Its totient is φ = 131311103225220.

The previous prime is 131311103225191. The next prime is 131311103225317. The reversal of 131311103225221 is 122522301113131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85077766985121 + 46233336240100 = 9223761^2 + 6799510^2 .

It is a cyclic number.

It is not a de Polignac number, because 131311103225221 - 2³⁵ = 131276743486853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131311103225221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131311103226221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65655551612610 + 65655551612611.

It is an arithmetic number, because the mean of its divisors is an integer number (65655551612611).

Almost surely, 2^{131311103225221} is an apocalyptic number.

It is an amenable number.

131311103225221 is a deficient number, since it is larger than the sum of its proper divisors (1).

131311103225221 is an equidigital number, since it uses as much as digits as its factorization.

131311103225221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 131311103225221 its reverse (122522301113131), we get a palindrome (253833404338352).

The spelling of 131311103225221 in words is "one hundred thirty-one trillion, three hundred eleven billion, one hundred three million, two hundred twenty-five thousand, two hundred twenty-one".