12171112182 has 48 divisors (see below), whose sum is σ = 27247054848. Its totient is φ = 3922467120.

The previous prime is 12171112181. The next prime is 12171112211. The reversal of 12171112182 is 28121117121.

It is a super-2 number, since 2×12171112182² (a number of 21 digits) contains 22 as substring.

It is a congruent 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 23 ways as a sum of consecutive naturals, for example, 616923 + ... + 636345.

It is an arithmetic number, because the mean of its divisors is an integer number (567646976).

Almost surely, 2^12171112182 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12171112182, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13623527424).

12171112182 is an abundant number, since it is smaller than the sum of its proper divisors (15075942666).

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

12171112182 is a wasteful number, since it uses less digits than its factorization.

12171112182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20585 (or 20582 counting only the distinct ones).

The product of its digits is 448, while the sum is 27.

The spelling of 12171112182 in words is "twelve billion, one hundred seventy-one million, one hundred twelve thousand, one hundred eighty-two".