13129044808021 has 12 divisors (see below), whose sum is σ = 14137822459492. Its totient is φ = 12187477513728.

The previous prime is 13129044807973. The next prime is 13129044808027. The reversal of 13129044808021 is 12080844092131.

It can be written as a sum of positive squares in 6 ways, for example, as 3162301097796 + 9966743710225 = 1778286^2 + 3157015^2 .

It is not a de Polignac number, because 13129044808021 - 2²¹ = 13129042710869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13129044808027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 311137950 + ... + 311180143.

Almost surely, 2^{13129044808021} is an apocalyptic number.

It is an amenable number.

13129044808021 is a deficient number, since it is larger than the sum of its proper divisors (1008777651471).

13129044808021 is an equidigital number, since it uses as much as digits as its factorization.

13129044808021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622318200 (or 622318183 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 43.

The spelling of 13129044808021 in words is "thirteen trillion, one hundred twenty-nine billion, forty-four million, eight hundred eight thousand, twenty-one".