12205642171 has 8 divisors (see below), whose sum is σ = 12308313600. Its totient is φ = 12103114920.

The previous prime is 12205642157. The next prime is 12205642181. The reversal of 12205642171 is 17124650221.

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

It is a cyclic number.

It is not a de Polignac number, because 12205642171 - 2¹¹ = 12205640123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12205642181) 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 7 ways as a sum of consecutive naturals, for example, 137470 + ... + 208108.

It is an arithmetic number, because the mean of its divisors is an integer number (1538539200).

Almost surely, 2^12205642171 is an apocalyptic number.

12205642171 is a deficient number, since it is larger than the sum of its proper divisors (102671429).

12205642171 is a wasteful number, since it uses less digits than its factorization.

12205642171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72089.

The product of its (nonzero) digits is 6720, while the sum is 31.

The spelling of 12205642171 in words is "twelve billion, two hundred five million, six hundred forty-two thousand, one hundred seventy-one".