12221221112200 has 96 divisors (see below), whose sum is σ = 29915402479200. Its totient is φ = 4630336842240.

The previous prime is 12221221112183. The next prime is 12221221112207. The reversal of 12221221112200 is 221112212221.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (12221221112207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20287747 + ... + 20881453.

It is an arithmetic number, because the mean of its divisors is an integer number (311618775825).

Almost surely, 2^{12221221112200} is an apocalyptic number.

12221221112200 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 12221221112200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14957701239600).

12221221112200 is an abundant number, since it is smaller than the sum of its proper divisors (17694181367000).

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

12221221112200 is a wasteful number, since it uses less digits than its factorization.

12221221112200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599159 (or 599150 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12221221112200 its reverse (221112212221), we get a palindrome (12442333324421).

The spelling of 12221221112200 in words is "twelve trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred twelve thousand, two hundred".