12321544144 has 80 divisors (see below), whose sum is σ = 29444171008. Its totient is φ = 4864167936.

The previous prime is 12321544141. The next prime is 12321544163. The reversal of 12321544144 is 44144512321.

It is a happy number.

It is a super-3 number, since 3×12321544144³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321544141) 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, 700384 + ... + 717760.

Almost surely, 2^12321544144 is an apocalyptic number.

12321544144 is a gapful number since it is divisible by the number (14) 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 12321544144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14722085504).

12321544144 is an abundant number, since it is smaller than the sum of its proper divisors (17122626864).

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

12321544144 is a wasteful number, since it uses less digits than its factorization.

12321544144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17892 (or 17886 counting only the distinct ones).

The product of its digits is 15360, while the sum is 31.

The spelling of 12321544144 in words is "twelve billion, three hundred twenty-one million, five hundred forty-four thousand, one hundred forty-four".