222022121221 has 2 divisors, whose sum is σ = 222022121222. Its totient is φ = 222022121220.

The previous prime is 222022121197. The next prime is 222022121263. The reversal of 222022121221 is 122121220222.

222022121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213338676996 + 8683444225 = 461886^2 + 93185^2 .

It is a cyclic number.

It is not a de Polignac number, because 222022121221 - 2²¹ = 222020024069 is a prime.

It is a super-2 number, since 2×222022121221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222022121281) 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, 111011060610 + 111011060611.

It is an arithmetic number, because the mean of its divisors is an integer number (111011060611).

Almost surely, 2^222022121221 is an apocalyptic number.

It is an amenable number.

222022121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222022121221 is an equidigital number, since it uses as much as digits as its factorization.

222022121221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 222022121221 its reverse (122121220222), we get a palindrome (344143341443).

Subtracting from 222022121221 its reverse (122121220222), we obtain a palindrome (99900900999).

The spelling of 222022121221 in words is "two hundred twenty-two billion, twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".