111221220211 has 2 divisors, whose sum is σ = 111221220212. Its totient is φ = 111221220210.

The previous prime is 111221220197. The next prime is 111221220251. The reversal of 111221220211 is 112022122111.

It is a weak prime.

It is an emirp because it is prime and its reverse (112022122111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111221220211 - 2²⁵ = 111187665779 is a prime.

It is not a weakly prime, because it can be changed into another prime (111221220251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610610105 + 55610610106.

It is an arithmetic number, because the mean of its divisors is an integer number (55610610106).

Almost surely, 2^111221220211 is an apocalyptic number.

111221220211 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221220211 is an equidigital number, since it uses as much as digits as its factorization.

111221220211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 111221220211 its reverse (112022122111), we get a palindrome (223243342322).

The spelling of 111221220211 in words is "one hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, two hundred eleven".