111221220120211 has 2 divisors, whose sum is σ = 111221220120212. Its totient is φ = 111221220120210.

The previous prime is 111221220120209. The next prime is 111221220120247. The reversal of 111221220120211 is 112021022122111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111221220120211 - 2¹ = 111221220120209 is a prime.

Together with 111221220120209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (111221220121211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610610060105 + 55610610060106.

It is an arithmetic number, because the mean of its divisors is an integer number (55610610060106).

Almost surely, 2^{111221220120211} is an apocalyptic number.

111221220120211 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221220120211 is an equidigital number, since it uses as much as digits as its factorization.

111221220120211 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 111221220120211 its reverse (112021022122111), we get a palindrome (223242242242322).

The spelling of 111221220120211 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twenty thousand, two hundred eleven".