129499939321 has 9 divisors (see below), whose sum is σ = 134130246861. Its totient is φ = 125024348064.

The previous prime is 129499939319. The next prime is 129499939333. The reversal of 129499939321 is 123939994921.

The square root of 129499939321 is 359861.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 40779359721 + 88720579600 = 201939^2 + 297860^2 .

It is not a de Polignac number, because 129499939321 - 2¹ = 129499939319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129499939321.

It is not an unprimeable number, because it can be changed into a prime (129499909321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10429765 + ... + 10442173.

Almost surely, 2^129499939321 is an apocalyptic number.

129499939321 is the 359861-st square number.

129499939321 is the 179931-st centered octagonal number.

It is an amenable number.

129499939321 is a deficient number, since it is larger than the sum of its proper divisors (4630307540).

129499939321 is an frugal number, since it uses more digits than its factorization.

129499939321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24876 (or 12438 counting only the distinct ones).

The product of its digits is 8503056, while the sum is 61.

The spelling of 129499939321 in words is "one hundred twenty-nine billion, four hundred ninety-nine million, nine hundred thirty-nine thousand, three hundred twenty-one".