222200121221 has 16 divisors (see below), whose sum is σ = 242603207280. Its totient is φ = 202270763520.

The previous prime is 222200121217. The next prime is 222200121223. The reversal of 222200121221 is 122121002222.

It is a happy number.

222200121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 115851736900 + 106348384321 = 340370^2 + 326111^2 .

It is a cyclic number.

It is not a de Polignac number, because 222200121221 - 2² = 222200121217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 222200121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222200121223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11177831 + ... + 11197691.

It is an arithmetic number, because the mean of its divisors is an integer number (15162700455).

Almost surely, 2^222200121221 is an apocalyptic number.

It is an amenable number.

222200121221 is a deficient number, since it is larger than the sum of its proper divisors (20403086059).

222200121221 is a wasteful number, since it uses less digits than its factorization.

222200121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31736.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 222200121221 its reverse (122121002222), we get a palindrome (344321123443).

The spelling of 222200121221 in words is "two hundred twenty-two billion, two hundred million, one hundred twenty-one thousand, two hundred twenty-one".