221222200 has 72 divisors (see below), whose sum is σ = 531930240. Its totient is φ = 85560000.

The previous prime is 221222191. The next prime is 221222203. The reversal of 221222200 is 2222122.

221222200 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222203) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 191625 + ... + 192775.

It is an arithmetic number, because the mean of its divisors is an integer number (7387920).

Almost surely, 2^221222200 is an apocalyptic number.

221222200 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 221222200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265965120).

221222200 is an abundant number, since it is smaller than the sum of its proper divisors (310708040).

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

221222200 is a wasteful number, since it uses less digits than its factorization.

221222200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229 (or 1189 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 221222200 is about 14873.5402645100. The cubic root of 221222200 is about 604.7969174721.

Adding to 221222200 its reverse (2222122), we get a palindrome (223444322).

The spelling of 221222200 in words is "two hundred twenty-one million, two hundred twenty-two thousand, two hundred".