222221222021 has 2 divisors, whose sum is σ = 222221222022. Its totient is φ = 222221222020.

The previous prime is 222221222009. The next prime is 222221222053. The reversal of 222221222021 is 120222122222.

222221222021 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., 205036896100 + 17184325921 = 452810^2 + 131089^2 .

It is a cyclic number.

It is not a de Polignac number, because 222221222021 - 2¹⁰ = 222221220997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222221221984 and 222221222002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222221222921) 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, 111110611010 + 111110611011.

It is an arithmetic number, because the mean of its divisors is an integer number (111110611011).

Almost surely, 2^222221222021 is an apocalyptic number.

It is an amenable number.

222221222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

222221222021 is an equidigital number, since it uses as much as digits as its factorization.

222221222021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 222221222021 its reverse (120222122222), we get a palindrome (342443344243).

The spelling of 222221222021 in words is "two hundred twenty-two billion, two hundred twenty-one million, two hundred twenty-two thousand, twenty-one".