221220220211 has 2 divisors, whose sum is σ = 221220220212. Its totient is φ = 221220220210.

The previous prime is 221220220187. The next prime is 221220220231. The reversal of 221220220211 is 112022022122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221220220211 - 2⁶ = 221220220147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221220220211.

It is not a weakly prime, because it can be changed into another prime (221220220231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610110105 + 110610110106.

It is an arithmetic number, because the mean of its divisors is an integer number (110610110106).

Almost surely, 2^221220220211 is an apocalyptic number.

221220220211 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220220211 is an equidigital number, since it uses as much as digits as its factorization.

221220220211 is an odious number, because the sum of its binary digits is odd.

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

Adding to 221220220211 its reverse (112022022122), we get a palindrome (333242242333).

The spelling of 221220220211 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred twenty thousand, two hundred eleven".