131423131323221 has 2 divisors, whose sum is σ = 131423131323222. Its totient is φ = 131423131323220.

The previous prime is 131423131323167. The next prime is 131423131323229. The reversal of 131423131323221 is 122323131324131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99630561843121 + 31792569480100 = 9981511^2 + 5638490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131423131323221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131423131323229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65711565661610 + 65711565661611.

It is an arithmetic number, because the mean of its divisors is an integer number (65711565661611).

Almost surely, 2^{131423131323221} is an apocalyptic number.

It is an amenable number.

131423131323221 is a deficient number, since it is larger than the sum of its proper divisors (1).

131423131323221 is an equidigital number, since it uses as much as digits as its factorization.

131423131323221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 32.

Adding to 131423131323221 its reverse (122323131324131), we get a palindrome (253746262647352).

The spelling of 131423131323221 in words is "one hundred thirty-one trillion, four hundred twenty-three billion, one hundred thirty-one million, three hundred twenty-three thousand, two hundred twenty-one".