12221212202112 has 128 divisors (see below), whose sum is σ = 34176505478400. Its totient is φ = 3858725606400.

The previous prime is 12221212202083. The next prime is 12221212202201. The reversal of 12221212202112 is 21120221212221.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47638987 + ... + 47894837.

It is an arithmetic number, because the mean of its divisors is an integer number (267003949050).

Almost surely, 2^{12221212202112} is an apocalyptic number.

12221212202112 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 12221212202112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17088252739200).

12221212202112 is an abundant number, since it is smaller than the sum of its proper divisors (21955293276288).

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

12221212202112 is a wasteful number, since it uses less digits than its factorization.

12221212202112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262434 (or 262422 counting only the distinct ones).

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

Adding to 12221212202112 its reverse (21120221212221), we get a palindrome (33341433414333).

The spelling of 12221212202112 in words is "twelve trillion, two hundred twenty-one billion, two hundred twelve million, two hundred two thousand, one hundred twelve".