12440421312 has 112 divisors (see below), whose sum is σ = 36226040832. Its totient is φ = 3736391680.

The previous prime is 12440421307. The next prime is 12440421319. The reversal of 12440421312 is 21312404421.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440421319) 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, 212593 + ... + 264719.

Almost surely, 2^12440421312 is an apocalyptic number.

12440421312 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 12440421312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18113020416).

12440421312 is an abundant number, since it is smaller than the sum of its proper divisors (23785619520).

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

12440421312 is a wasteful number, since it uses less digits than its factorization.

12440421312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52266 (or 52256 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 12440421312 its reverse (21312404421), we get a palindrome (33752825733).

The spelling of 12440421312 in words is "twelve billion, four hundred forty million, four hundred twenty-one thousand, three hundred twelve".