2222442221 has 2 divisors, whose sum is σ = 2222442222. Its totient is φ = 2222442220.

The previous prime is 2222442197. The next prime is 2222442239. The reversal of 2222442221 is 1222442222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1123188196 + 1099254025 = 33514^2 + 33155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2222442221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2222442281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1111221110 + 1111221111.

It is an arithmetic number, because the mean of its divisors is an integer number (1111221111).

Almost surely, 2^2222442221 is an apocalyptic number.

It is an amenable number.

2222442221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2222442221 is an equidigital number, since it uses as much as digits as its factorization.

2222442221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2048, while the sum is 23.

The square root of 2222442221 is about 47142.7854607680. The cubic root of 2222442221 is about 1304.9989422734.

Adding to 2222442221 its reverse (1222442222), we get a palindrome (3444884443).

Subtracting from 2222442221 its reverse (1222442222), we obtain a palindrome (999999999).

The spelling of 2222442221 in words is "two billion, two hundred twenty-two million, four hundred forty-two thousand, two hundred twenty-one".