221212112102200 has 96 divisors (see below), whose sum is σ = 517611808514160. Its totient is φ = 87918234393600.

The previous prime is 221212112102183. The next prime is 221212112102203. The reversal of 221212112102200 is 2201211212122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212112102203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1066271679 + ... + 1066479121.

Almost surely, 2^{221212112102200} is an apocalyptic number.

221212112102200 is a gapful number since it is divisible by the number (20) 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 221212112102200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258805904257080).

221212112102200 is an abundant number, since it is smaller than the sum of its proper divisors (296399696411960).

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

221212112102200 is a wasteful number, since it uses less digits than its factorization.

221212112102200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241577 (or 241568 counting only the distinct ones).

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

Adding to 221212112102200 its reverse (2201211212122), we get a palindrome (223413323314322).

The spelling of 221212112102200 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred twelve million, one hundred two thousand, two hundred".