129200444521 has 2 divisors, whose sum is σ = 129200444522. Its totient is φ = 129200444520.

The previous prime is 129200444479. The next prime is 129200444531. The reversal of 129200444521 is 125444002921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113744982121 + 15455462400 = 337261^2 + 124320^2 .

It is a cyclic number.

It is not a de Polignac number, because 129200444521 - 2¹¹ = 129200442473 is a prime.

It is not a weakly prime, because it can be changed into another prime (129200444531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64600222260 + 64600222261.

It is an arithmetic number, because the mean of its divisors is an integer number (64600222261).

Almost surely, 2^129200444521 is an apocalyptic number.

It is an amenable number.

129200444521 is a deficient number, since it is larger than the sum of its proper divisors (1).

129200444521 is an equidigital number, since it uses as much as digits as its factorization.

129200444521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 34.

The spelling of 129200444521 in words is "one hundred twenty-nine billion, two hundred million, four hundred forty-four thousand, five hundred twenty-one".