12172322112 has 112 divisors (see below), whose sum is σ = 33508687872. Its totient is φ = 3895395840.

The previous prime is 12172322111. The next prime is 12172322159. The reversal of 12172322112 is 21122327121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12172322111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 747853 + ... + 763955.

Almost surely, 2^12172322112 is an apocalyptic number.

12172322112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12172322112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16754343936).

12172322112 is an abundant number, since it is smaller than the sum of its proper divisors (21336365760).

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

12172322112 is a wasteful number, since it uses less digits than its factorization.

12172322112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16276 (or 16266 counting only the distinct ones).

The product of its digits is 672, while the sum is 24.

Adding to 12172322112 its reverse (21122327121), we get a palindrome (33294649233).

The spelling of 12172322112 in words is "twelve billion, one hundred seventy-two million, three hundred twenty-two thousand, one hundred twelve".