129634443121 has 2 divisors, whose sum is σ = 129634443122. Its totient is φ = 129634443120.

The previous prime is 129634443073. The next prime is 129634443149. The reversal of 129634443121 is 121344436921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119276292496 + 10358150625 = 345364^2 + 101775^2 .

It is an emirp because it is prime and its reverse (121344436921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129634443121 - 2¹⁹ = 129633918833 is a prime.

It is not a weakly prime, because it can be changed into another prime (129634449121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64817221560 + 64817221561.

It is an arithmetic number, because the mean of its divisors is an integer number (64817221561).

Almost surely, 2^129634443121 is an apocalyptic number.

It is an amenable number.

129634443121 is a deficient number, since it is larger than the sum of its proper divisors (1).

129634443121 is an equidigital number, since it uses as much as digits as its factorization.

129634443121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 40.

The spelling of 129634443121 in words is "one hundred twenty-nine billion, six hundred thirty-four million, four hundred forty-three thousand, one hundred twenty-one".