221110111222111 has 2 divisors, whose sum is σ = 221110111222112. Its totient is φ = 221110111222110.

The previous prime is 221110111222109. The next prime is 221110111222153. The reversal of 221110111222111 is 111222111011122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221110111222111 - 2¹ = 221110111222109 is a prime.

Together with 221110111222109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221110111222171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555055611055 + 110555055611056.

It is an arithmetic number, because the mean of its divisors is an integer number (110555055611056).

Almost surely, 2^{221110111222111} is an apocalyptic number.

221110111222111 is a deficient number, since it is larger than the sum of its proper divisors (1).

221110111222111 is an equidigital number, since it uses as much as digits as its factorization.

221110111222111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 221110111222111 its reverse (111222111011122), we get a palindrome (332332222233233).

The spelling of 221110111222111 in words is "two hundred twenty-one trillion, one hundred ten billion, one hundred eleven million, two hundred twenty-two thousand, one hundred eleven".