2222221121 has 2 divisors, whose sum is σ = 2222221122. Its totient is φ = 2222221120.

The previous prime is 2222221087. The next prime is 2222221159. The reversal of 2222221121 is 1211222222.

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., 1363086400 + 859134721 = 36920^2 + 29311^2 .

It is a cyclic number.

It is not a de Polignac number, because 2222221121 - 2¹⁴ = 2222204737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2222221121.

It is not a weakly prime, because it can be changed into another prime (2222221321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1111110560 + 1111110561.

It is an arithmetic number, because the mean of its divisors is an integer number (1111110561).

Almost surely, 2^2222221121 is an apocalyptic number.

It is an amenable number.

2222221121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2222221121 is an equidigital number, since it uses as much as digits as its factorization.

2222221121 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2222221121 is about 47140.4403988762. The cubic root of 2222221121 is about 1304.9556648326.

Adding to 2222221121 its reverse (1211222222), we get a palindrome (3433443343).

The spelling of 2222221121 in words is "two billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred twenty-one".