221111222200 has 192 divisors, whose sum is σ = 586907078400. Its totient is φ = 76684185600.

The previous prime is 221111222179. The next prime is 221111222309. The reversal of 221111222200 is 2222111122.

It is a happy number.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 17855611 + ... + 17867989.

It is an arithmetic number, because the mean of its divisors is an integer number (3056807700).

Almost surely, 2^221111222200 is an apocalyptic number.

221111222200 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 221111222200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293453539200).

221111222200 is an abundant number, since it is smaller than the sum of its proper divisors (365795856200).

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

221111222200 is a wasteful number, since it uses less digits than its factorization.

221111222200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12782 (or 12773 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221111222200 its reverse (2222111122), we get a palindrome (223333333322).

The spelling of 221111222200 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred twenty-two thousand, two hundred".