221800222 has 8 divisors (see below), whose sum is σ = 380228976. Its totient is φ = 95057232.

The previous prime is 221800219. The next prime is 221800223. The reversal of 221800222 is 222008122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 221800222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221800223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7921423 + ... + 7921450.

It is an arithmetic number, because the mean of its divisors is an integer number (47528622).

Almost surely, 2^221800222 is an apocalyptic number.

221800222 is a deficient number, since it is larger than the sum of its proper divisors (158428754).

221800222 is a wasteful number, since it uses less digits than its factorization.

221800222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15842882.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 221800222 is about 14892.9588060936. The cubic root of 221800222 is about 605.3232086737.

Adding to 221800222 its reverse (222008122), we get a palindrome (443808344).

The spelling of 221800222 in words is "two hundred twenty-one million, eight hundred thousand, two hundred twenty-two".