129221292138 has 8 divisors (see below), whose sum is σ = 258442584288. Its totient is φ = 43073764044.

The previous prime is 129221292133. The next prime is 129221292163. The reversal of 129221292138 is 831292122921.

It is a sphenic number, since it is the product of 3 distinct primes.

129221292138 is an admirable number.

It is a super-2 number, since 2×129221292138² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129221292138.

It is not an unprimeable number, because it can be changed into a prime (129221292133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10768441006 + ... + 10768441017.

It is an arithmetic number, because the mean of its divisors is an integer number (32305323036).

Almost surely, 2^129221292138 is an apocalyptic number.

129221292138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129221292138 is a wasteful number, since it uses less digits than its factorization.

129221292138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21536882028.

The product of its digits is 62208, while the sum is 42.

The spelling of 129221292138 in words is "one hundred twenty-nine billion, two hundred twenty-one million, two hundred ninety-two thousand, one hundred thirty-eight".