129771399227 has 4 divisors (see below), whose sum is σ = 135413634000. Its totient is φ = 124129164456.

The previous prime is 129771399209. The next prime is 129771399229. The reversal of 129771399227 is 722993177921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 722993177921 = 7 ⋅103284739703.

It is a cyclic number.

It is not a de Polignac number, because 129771399227 - 2¹⁴ = 129771382843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129771399229) 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, 2821117352 + ... + 2821117397.

It is an arithmetic number, because the mean of its divisors is an integer number (33853408500).

Almost surely, 2^129771399227 is an apocalyptic number.

129771399227 is a deficient number, since it is larger than the sum of its proper divisors (5642234773).

129771399227 is an equidigital number, since it uses as much as digits as its factorization.

129771399227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5642234772.

The product of its digits is 6001128, while the sum is 59.

The spelling of 129771399227 in words is "one hundred twenty-nine billion, seven hundred seventy-one million, three hundred ninety-nine thousand, two hundred twenty-seven".