131221312073 has 2 divisors, whose sum is σ = 131221312074. Its totient is φ = 131221312072.

The previous prime is 131221312009. The next prime is 131221312127. The reversal of 131221312073 is 370213122131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66273808969 + 64947503104 = 257437^2 + 254848^2 .

It is a cyclic number.

It is not a de Polignac number, because 131221312073 - 2⁶ = 131221312009 is a prime.

It is not a weakly prime, because it can be changed into another prime (131221314073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65610656036 + 65610656037.

It is an arithmetic number, because the mean of its divisors is an integer number (65610656037).

Almost surely, 2^131221312073 is an apocalyptic number.

It is an amenable number.

131221312073 is a deficient number, since it is larger than the sum of its proper divisors (1).

131221312073 is an equidigital number, since it uses as much as digits as its factorization.

131221312073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The spelling of 131221312073 in words is "one hundred thirty-one billion, two hundred twenty-one million, three hundred twelve thousand, seventy-three".