12111221212200 has 576 divisors, whose sum is σ = 46294031188800. Its totient is φ = 2886240729600.

The previous prime is 12111221212151. The next prime is 12111221212219. The reversal of 12111221212200 is 221212211121.

12111221212200 is a `hidden beast` number, since 1 + 21 + 11 + 221 + 212 + 200 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 206742114 + ... + 206800686.

It is an arithmetic number, because the mean of its divisors is an integer number (80371581925).

Almost surely, 2^{12111221212200} is an apocalyptic number.

12111221212200 is a gapful number since it is divisible by the number (10) 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 12111221212200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23147015594400).

12111221212200 is an abundant number, since it is smaller than the sum of its proper divisors (34182809976600).

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

12111221212200 is a wasteful number, since it uses less digits than its factorization.

12111221212200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58727 (or 58653 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12111221212200 its reverse (221212211121), we get a palindrome (12332433423321).

It can be divided in two parts, 121112 and 21212200, that added together give a palindrome (21333312).

The spelling of 12111221212200 in words is "twelve trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twelve thousand, two hundred".