222201021221 has 2 divisors, whose sum is σ = 222201021222. Its totient is φ = 222201021220.

The previous prime is 222201021209. The next prime is 222201021227. The reversal of 222201021221 is 122120102222.

It is a happy number.

222201021221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221666764225 + 534256996 = 470815^2 + 23114^2 .

It is a cyclic number.

It is not a de Polignac number, because 222201021221 - 2⁶ = 222201021157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222201021221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222201021227) 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 as a sum of consecutive naturals, namely, 111100510610 + 111100510611.

It is an arithmetic number, because the mean of its divisors is an integer number (111100510611).

Almost surely, 2^222201021221 is an apocalyptic number.

It is an amenable number.

222201021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222201021221 is an equidigital number, since it uses as much as digits as its factorization.

222201021221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 222201021221 its reverse (122120102222), we get a palindrome (344321123443).

The spelling of 222201021221 in words is "two hundred twenty-two billion, two hundred one million, twenty-one thousand, two hundred twenty-one".