11221220211211 has 2 divisors, whose sum is σ = 11221220211212. Its totient is φ = 11221220211210.

The previous prime is 11221220211197. The next prime is 11221220211263. The reversal of 11221220211211 is 11211202212211.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11221220211211 - 2¹⁷ = 11221220080139 is a prime.

It is not a weakly prime, because it can be changed into another prime (11221220211011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610610105605 + 5610610105606.

It is an arithmetic number, because the mean of its divisors is an integer number (5610610105606).

Almost surely, 2^{11221220211211} is an apocalyptic number.

11221220211211 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221220211211 is an equidigital number, since it uses as much as digits as its factorization.

11221220211211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11221220211211 its reverse (11211202212211), we get a palindrome (22432422423422).

The spelling of 11221220211211 in words is "eleven trillion, two hundred twenty-one billion, two hundred twenty million, two hundred eleven thousand, two hundred eleven".