129302370521 has 2 divisors, whose sum is σ = 129302370522. Its totient is φ = 129302370520.

The previous prime is 129302370503. The next prime is 129302370523. The reversal of 129302370521 is 125073203921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117347353600 + 11955016921 = 342560^2 + 109339^2 .

It is an emirp because it is prime and its reverse (125073203921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129302370521 is a prime.

It is a super-2 number, since 2×129302370521² (a number of 23 digits) contains 22 as substring.

Together with 129302370523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129302370523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64651185260 + 64651185261.

It is an arithmetic number, because the mean of its divisors is an integer number (64651185261).

Almost surely, 2^129302370521 is an apocalyptic number.

It is an amenable number.

129302370521 is a deficient number, since it is larger than the sum of its proper divisors (1).

129302370521 is an equidigital number, since it uses as much as digits as its factorization.

129302370521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The spelling of 129302370521 in words is "one hundred twenty-nine billion, three hundred two million, three hundred seventy thousand, five hundred twenty-one".