129705388221 has 16 divisors (see below), whose sum is σ = 177668604800. Its totient is φ = 84107636928.

The previous prime is 129705388199. The next prime is 129705388303. The reversal of 129705388221 is 122883507921.

It is not a de Polignac number, because 129705388221 - 2¹⁰ = 129705387197 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 (129705388321) 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 15 ways as a sum of consecutive naturals, for example, 192375 + ... + 544443.

It is an arithmetic number, because the mean of its divisors is an integer number (11104287800).

Almost surely, 2^129705388221 is an apocalyptic number.

It is an amenable number.

129705388221 is a deficient number, since it is larger than the sum of its proper divisors (47963216579).

129705388221 is a wasteful number, since it uses less digits than its factorization.

129705388221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355428.

The product of its (nonzero) digits is 483840, while the sum is 48.

The spelling of 129705388221 in words is "one hundred twenty-nine billion, seven hundred five million, three hundred eighty-eight thousand, two hundred twenty-one".