129013321 has 2 divisors, whose sum is σ = 129013322. Its totient is φ = 129013320.

The previous prime is 129013307. The next prime is 129013327. The reversal of 129013321 is 123310921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89775625 + 39237696 = 9475^2 + 6264^2 .

It is an emirp because it is prime and its reverse (123310921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129013321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129013292 and 129013301.

It is not a weakly prime, because it can be changed into another prime (129013327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64506660 + 64506661.

It is an arithmetic number, because the mean of its divisors is an integer number (64506661).

Almost surely, 2^129013321 is an apocalyptic number.

It is an amenable number.

129013321 is a deficient number, since it is larger than the sum of its proper divisors (1).

129013321 is an equidigital number, since it uses as much as digits as its factorization.

129013321 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 square root of 129013321 is about 11358.4031007884. The cubic root of 129013321 is about 505.2948263721.

The spelling of 129013321 in words is "one hundred twenty-nine million, thirteen thousand, three hundred twenty-one".