129931139921 has 16 divisors (see below), whose sum is σ = 142306424640. Its totient is φ = 117650364480.

The previous prime is 129931139887. The next prime is 129931139939.

129931139921 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 129931139921 - 2¹⁴ = 129931123537 is a prime.

It is a super-2 number, since 2×129931139921² (a number of 23 digits) contains 22 as substring.

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 129931139921.

It is not an unprimeable number, because it can be changed into a prime (129931139951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4438310 + ... + 4467488.

It is an arithmetic number, because the mean of its divisors is an integer number (8894151540).

Almost surely, 2^129931139921 is an apocalyptic number.

129931139921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

129931139921 is a deficient number, since it is larger than the sum of its proper divisors (12375284719).

129931139921 is a wasteful number, since it uses less digits than its factorization.

129931139921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30784.

The product of its digits is 236196, while the sum is 50.

The spelling of 129931139921 in words is "one hundred twenty-nine billion, nine hundred thirty-one million, one hundred thirty-nine thousand, nine hundred twenty-one".