12891173232 has 120 divisors (see below), whose sum is σ = 39230227200. Its totient is φ = 3636517248.

The previous prime is 12891173231. The next prime is 12891173237. The reversal of 12891173232 is 23237119821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12891173231) 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, 151119 + ... + 220497.

It is an arithmetic number, because the mean of its divisors is an integer number (326918560).

Almost surely, 2^12891173232 is an apocalyptic number.

12891173232 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 12891173232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19615113600).

12891173232 is an abundant number, since it is smaller than the sum of its proper divisors (26339053968).

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

12891173232 is a wasteful number, since it uses less digits than its factorization.

12891173232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69483 (or 69470 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The spelling of 12891173232 in words is "twelve billion, eight hundred ninety-one million, one hundred seventy-three thousand, two hundred thirty-two".