12021002112 has 128 divisors (see below), whose sum is σ = 36539827200. Its totient is φ = 3430103040.

The previous prime is 12021002101. The next prime is 12021002131. The reversal of 12021002112 is 21120012021.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2446314 + ... + 2451222.

It is an arithmetic number, because the mean of its divisors is an integer number (285467400).

Almost surely, 2^12021002112 is an apocalyptic number.

12021002112 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 12021002112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18269913600).

12021002112 is an abundant number, since it is smaller than the sum of its proper divisors (24518825088).

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

12021002112 is an equidigital number, since it uses as much as digits as its factorization.

12021002112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5844 (or 5832 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12021002112 its reverse (21120012021), we get a palindrome (33141014133).

Subtracting 12021002112 from its reverse (21120012021), we obtain a palindrome (9099009909).

The spelling of 12021002112 in words is "twelve billion, twenty-one million, two thousand, one hundred twelve".