12129044571 has 20 divisors (see below), whose sum is σ = 20707082352. Its totient is φ = 6930882288.

The previous prime is 12129044569. The next prime is 12129044581. The reversal of 12129044571 is 17544092121.

12129044571 is a `hidden beast` number, since 1 + 21 + 29 + 0 + 44 + 571 = 666.

12129044571 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12129044571 - 2¹ = 12129044569 is a prime.

It is a super-2 number, since 2×12129044571² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (12129044581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10695240 + ... + 10696373.

Almost surely, 2^12129044571 is an apocalyptic number.

12129044571 is a deficient number, since it is larger than the sum of its proper divisors (8578037781).

12129044571 is an equidigital number, since it uses as much as digits as its factorization.

12129044571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21391632 (or 21391623 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 12129044571 in words is "twelve billion, one hundred twenty-nine million, forty-four thousand, five hundred seventy-one".