129398922321 has 16 divisors (see below), whose sum is σ = 185183313984. Its totient is φ = 80079266304.

The previous prime is 129398922319. The next prime is 129398922347. The reversal of 129398922321 is 123229893921.

It is not a de Polignac number, because 129398922321 - 2¹ = 129398922319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (129398922721) 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 in 15 ways as a sum of consecutive naturals, for example, 17374591 + ... + 17382036.

It is an arithmetic number, because the mean of its divisors is an integer number (11573957124).

Almost surely, 2^129398922321 is an apocalyptic number.

It is an amenable number.

129398922321 is a deficient number, since it is larger than the sum of its proper divisors (55784391663).

129398922321 is a wasteful number, since it uses less digits than its factorization.

129398922321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34756720.

The product of its digits is 839808, while the sum is 51.

The spelling of 129398922321 in words is "one hundred twenty-nine billion, three hundred ninety-eight million, nine hundred twenty-two thousand, three hundred twenty-one".