12173521512 has 128 divisors (see below), whose sum is σ = 32530636800. Its totient is φ = 3794546624.

The previous prime is 12173521501. The next prime is 12173521567. The reversal of 12173521512 is 21512537121.

It is a super-2 number, since 2×12173521512² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12173521512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13723933 + ... + 13724819.

It is an arithmetic number, because the mean of its divisors is an integer number (254145600).

Almost surely, 2^12173521512 is an apocalyptic number.

12173521512 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 12173521512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16265318400).

12173521512 is an abundant number, since it is smaller than the sum of its proper divisors (20357115288).

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

12173521512 is an equidigital number, since it uses as much as digits as its factorization.

12173521512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012 (or 962 counting only the distinct ones).

The product of its digits is 4200, while the sum is 30.

The spelling of 12173521512 in words is "twelve billion, one hundred seventy-three million, five hundred twenty-one thousand, five hundred twelve".