12021221222112 has 96 divisors (see below), whose sum is σ = 32688012067200. Its totient is φ = 3863662806528.

The previous prime is 12021221222111. The next prime is 12021221222189. The reversal of 12021221222112 is 21122212212021.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021221222111) 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, 864118 + ... + 4978869.

It is an arithmetic number, because the mean of its divisors is an integer number (340500125700).

Almost surely, 2^{12021221222112} is an apocalyptic number.

12021221222112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12021221222112 is an abundant number, since it is smaller than the sum of its proper divisors (20666790845088).

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

12021221222112 is a wasteful number, since it uses less digits than its factorization.

12021221222112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5843768 (or 5843760 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 12021221222112 its reverse (21122212212021), we get a palindrome (33143433434133).

The spelling of 12021221222112 in words is "twelve trillion, twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred twelve".