129513421 has 2 divisors, whose sum is σ = 129513422. Its totient is φ = 129513420.

The previous prime is 129513413. The next prime is 129513451. The reversal of 129513421 is 124315921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105884100 + 23629321 = 10290^2 + 4861^2 .

It is a cyclic number.

It is not a de Polignac number, because 129513421 - 2³ = 129513413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129513421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129513401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64756710 + 64756711.

It is an arithmetic number, because the mean of its divisors is an integer number (64756711).

Almost surely, 2^129513421 is an apocalyptic number.

It is an amenable number.

129513421 is a deficient number, since it is larger than the sum of its proper divisors (1).

129513421 is an equidigital number, since it uses as much as digits as its factorization.

129513421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 28.

The square root of 129513421 is about 11380.3963463493. The cubic root of 129513421 is about 505.9468834035.

The spelling of 129513421 in words is "one hundred twenty-nine million, five hundred thirteen thousand, four hundred twenty-one".