129526591421 has 2 divisors, whose sum is σ = 129526591422. Its totient is φ = 129526591420.

The previous prime is 129526591349. The next prime is 129526591427. The reversal of 129526591421 is 124195625921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126985322500 + 2541268921 = 356350^2 + 50411^2 .

It is an emirp because it is prime and its reverse (124195625921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129526591421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129526591427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64763295710 + 64763295711.

It is an arithmetic number, because the mean of its divisors is an integer number (64763295711).

Almost surely, 2^129526591421 is an apocalyptic number.

It is an amenable number.

129526591421 is a deficient number, since it is larger than the sum of its proper divisors (1).

129526591421 is an equidigital number, since it uses as much as digits as its factorization.

129526591421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 47.

The spelling of 129526591421 in words is "one hundred twenty-nine billion, five hundred twenty-six million, five hundred ninety-one thousand, four hundred twenty-one".