2222552221 has 2 divisors, whose sum is σ = 2222552222. Its totient is φ = 2222552220.

The previous prime is 2222552203. The next prime is 2222552237. The reversal of 2222552221 is 1222552222.

It is a happy number.

2222552221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2035272996 + 187279225 = 45114^2 + 13685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2222552221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2222552201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1111276110 + 1111276111.

It is an arithmetic number, because the mean of its divisors is an integer number (1111276111).

Almost surely, 2^2222552221 is an apocalyptic number.

It is an amenable number.

2222552221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2222552221 is an equidigital number, since it uses as much as digits as its factorization.

2222552221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3200, while the sum is 25.

The square root of 2222552221 is about 47143.9521147729. The cubic root of 2222552221 is about 1305.0204722693.

Subtracting from 2222552221 its reverse (1222552222), we obtain a palindrome (999999999).

The spelling of 2222552221 in words is "two billion, two hundred twenty-two million, five hundred fifty-two thousand, two hundred twenty-one".