131221230432109 has 2 divisors, whose sum is σ = 131221230432110. Its totient is φ = 131221230432108.

The previous prime is 131221230432011. The next prime is 131221230432137. The reversal of 131221230432109 is 901234032122131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81261029960100 + 49960200472009 = 9014490^2 + 7068253^2 .

It is an emirp because it is prime and its reverse (901234032122131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131221230432109 - 2²³ = 131221222043501 is a prime.

It is a super-2 number, since 2×131221230432109² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131221230472109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65610615216054 + 65610615216055.

It is an arithmetic number, because the mean of its divisors is an integer number (65610615216055).

Almost surely, 2^{131221230432109} is an apocalyptic number.

It is an amenable number.

131221230432109 is a deficient number, since it is larger than the sum of its proper divisors (1).

131221230432109 is an equidigital number, since it uses as much as digits as its factorization.

131221230432109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 131221230432109 in words is "one hundred thirty-one trillion, two hundred twenty-one billion, two hundred thirty million, four hundred thirty-two thousand, one hundred nine".