131221030009 has 2 divisors, whose sum is σ = 131221030010. Its totient is φ = 131221030008.

The previous prime is 131221030001. The next prime is 131221030027. The reversal of 131221030009 is 900030122131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123484068409 + 7736961600 = 351403^2 + 87960^2 .

It is a cyclic number.

It is not a de Polignac number, because 131221030009 - 2³ = 131221030001 is a prime.

It is not a weakly prime, because it can be changed into another prime (131221030001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65610515004 + 65610515005.

It is an arithmetic number, because the mean of its divisors is an integer number (65610515005).

Almost surely, 2^131221030009 is an apocalyptic number.

It is an amenable number.

131221030009 is a deficient number, since it is larger than the sum of its proper divisors (1).

131221030009 is an equidigital number, since it uses as much as digits as its factorization.

131221030009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The spelling of 131221030009 in words is "one hundred thirty-one billion, two hundred twenty-one million, thirty thousand, nine".