12171112171 has 4 divisors (see below), whose sum is σ = 12191847192. Its totient is φ = 12150377152.

The previous prime is 12171112157. The next prime is 12171112181. The reversal of 12171112171 is 17121117121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12171112171 - 2⁵ = 12171112139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12171112181) 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, 10366630 + ... + 10367803.

It is an arithmetic number, because the mean of its divisors is an integer number (3047961798).

Almost surely, 2^12171112171 is an apocalyptic number.

12171112171 is a deficient number, since it is larger than the sum of its proper divisors (20735021).

12171112171 is an equidigital number, since it uses as much as digits as its factorization.

12171112171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20735020.

The product of its digits is 196, while the sum is 25.

Adding to 12171112171 its reverse (17121117121), we get a palindrome (29292229292).

The spelling of 12171112171 in words is "twelve billion, one hundred seventy-one million, one hundred twelve thousand, one hundred seventy-one".