12321503440 has 120 divisors (see below), whose sum is σ = 30519876960. Its totient is φ = 4625270784.

The previous prime is 12321503417. The next prime is 12321503471. The reversal of 12321503440 is 4430512321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12091251 + ... + 12092269.

It is an arithmetic number, because the mean of its divisors is an integer number (254332308).

Almost surely, 2^12321503440 is an apocalyptic number.

12321503440 is a gapful number since it is divisible by the number (10) 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 12321503440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15259938480).

12321503440 is an abundant number, since it is smaller than the sum of its proper divisors (18198373520).

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

12321503440 is a wasteful number, since it uses less digits than its factorization.

12321503440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589 (or 1566 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The spelling of 12321503440 in words is "twelve billion, three hundred twenty-one million, five hundred three thousand, four hundred forty".