2221212211 has 2 divisors, whose sum is σ = 2221212212. Its totient is φ = 2221212210.

The previous prime is 2221212179. The next prime is 2221212223. The reversal of 2221212211 is 1122121222.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2221212211 - 2⁵ = 2221212179 is a prime.

It is not a weakly prime, because it can be changed into another prime (2221212011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110606105 + 1110606106.

It is an arithmetic number, because the mean of its divisors is an integer number (1110606106).

Almost surely, 2^2221212211 is an apocalyptic number.

2221212211 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221212211 is an equidigital number, since it uses as much as digits as its factorization.

2221212211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64, while the sum is 16.

The square root of 2221212211 is about 47129.7380748079. The cubic root of 2221212211 is about 1304.7581474172.

Adding to 2221212211 its reverse (1122121222), we get a palindrome (3343333433).

It can be divided in two parts, 222121221 and 1, that added together give a palindrome (222121222).

The spelling of 2221212211 in words is "two billion, two hundred twenty-one million, two hundred twelve thousand, two hundred eleven".