110111111222221 has 2 divisors, whose sum is σ = 110111111222222. Its totient is φ = 110111111222220.

The previous prime is 110111111222213. The next prime is 110111111222227. The reversal of 110111111222221 is 122222111111011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62900538932196 + 47210572290025 = 7930986^2 + 6870995^2 .

It is a cyclic number.

It is not a de Polignac number, because 110111111222221 - 2³ = 110111111222213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (110111111222227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55055555611110 + 55055555611111.

It is an arithmetic number, because the mean of its divisors is an integer number (55055555611111).

Almost surely, 2^{110111111222221} is an apocalyptic number.

It is an amenable number.

110111111222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

110111111222221 is an equidigital number, since it uses as much as digits as its factorization.

110111111222221 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 110111111222221 its reverse (122222111111011), we get a palindrome (232333222333232).

The spelling of 110111111222221 in words is "one hundred ten trillion, one hundred eleven billion, one hundred eleven million, two hundred twenty-two thousand, two hundred twenty-one".