111220110121 has 2 divisors, whose sum is σ = 111220110122. Its totient is φ = 111220110120.

The previous prime is 111220110107. The next prime is 111220110143. The reversal of 111220110121 is 121011022111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73243844496 + 37976265625 = 270636^2 + 194875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111220110121 is a prime.

It is not a weakly prime, because it can be changed into another prime (111220110101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610055060 + 55610055061.

It is an arithmetic number, because the mean of its divisors is an integer number (55610055061).

Almost surely, 2^111220110121 is an apocalyptic number.

It is an amenable number.

111220110121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111220110121 is an equidigital number, since it uses as much as digits as its factorization.

111220110121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111220110121 its reverse (121011022111), we get a palindrome (232231132232).

The spelling of 111220110121 in words is "one hundred eleven billion, two hundred twenty million, one hundred ten thousand, one hundred twenty-one".