12321102170172 has 192 divisors, whose sum is σ = 31578163527680. Its totient is φ = 3725190653184.

The previous prime is 12321102170171. The next prime is 12321102170339. The reversal of 12321102170172 is 27107120112321.

12321102170172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321102170171) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 546548733 + ... + 546571275.

Almost surely, 2^{12321102170172} is an apocalyptic number.

12321102170172 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 12321102170172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15789081763840).

12321102170172 is an abundant number, since it is smaller than the sum of its proper divisors (19257061357508).

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

12321102170172 is a wasteful number, since it uses less digits than its factorization.

12321102170172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23640 (or 23638 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 30.

Adding to 12321102170172 its reverse (27107120112321), we get a palindrome (39428222282493).

The spelling of 12321102170172 in words is "twelve trillion, three hundred twenty-one billion, one hundred two million, one hundred seventy thousand, one hundred seventy-two".