12021443412 has 144 divisors (see below), whose sum is σ = 33334566720. Its totient is φ = 3357573120.

The previous prime is 12021443387. The next prime is 12021443437. The reversal of 12021443412 is 21434412021.

It is an interprime number because it is at equal distance from previous prime (12021443387) and next prime (12021443437).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1014868 + ... + 1026644.

Almost surely, 2^12021443412 is an apocalyptic number.

12021443412 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 12021443412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16667283360).

12021443412 is an abundant number, since it is smaller than the sum of its proper divisors (21313123308).

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

12021443412 is a wasteful number, since it uses less digits than its factorization.

12021443412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11862 (or 11849 counting only the distinct ones).

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

Adding to 12021443412 its reverse (21434412021), we get a palindrome (33455855433).

The spelling of 12021443412 in words is "twelve billion, twenty-one million, four hundred forty-three thousand, four hundred twelve".