110111111220221 has 2 divisors, whose sum is σ = 110111111220222. Its totient is φ = 110111111220220.

The previous prime is 110111111220217. The next prime is 110111111220247. The reversal of 110111111220221 is 122022111111011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62590961988025 + 47520149232196 = 7911445^2 + 6893486^2 .

It is a cyclic number.

It is not a de Polignac number, because 110111111220221 - 2² = 110111111220217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 110111111220221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (110111111222221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55055555610110 + 55055555610111.

It is an arithmetic number, because the mean of its divisors is an integer number (55055555610111).

Almost surely, 2^{110111111220221} is an apocalyptic number.

It is an amenable number.

110111111220221 is a deficient number, since it is larger than the sum of its proper divisors (1).

110111111220221 is an equidigital number, since it uses as much as digits as its factorization.

110111111220221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 110111111220221 its reverse (122022111111011), we get a palindrome (232133222331232).

The spelling of 110111111220221 in words is "one hundred ten trillion, one hundred eleven billion, one hundred eleven million, two hundred twenty thousand, two hundred twenty-one".