222011110121221 has 2 divisors, whose sum is σ = 222011110121222. Its totient is φ = 222011110121220.

The previous prime is 222011110121191. The next prime is 222011110121257. The reversal of 222011110121221 is 122121011110222.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172154999016225 + 49856111104996 = 13120785^2 + 7060886^2 .

It is a cyclic number.

It is not a de Polignac number, because 222011110121221 - 2⁵ = 222011110121189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222011110121261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111005555060610 + 111005555060611.

It is an arithmetic number, because the mean of its divisors is an integer number (111005555060611).

Almost surely, 2^{222011110121221} is an apocalyptic number.

It is an amenable number.

222011110121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222011110121221 is an equidigital number, since it uses as much as digits as its factorization.

222011110121221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 222011110121221 its reverse (122121011110222), we get a palindrome (344132121231443).

The spelling of 222011110121221 in words is "two hundred twenty-two trillion, eleven billion, one hundred ten million, one hundred twenty-one thousand, two hundred twenty-one".