111221102112121 has 2 divisors, whose sum is σ = 111221102112122. Its totient is φ = 111221102112120.

The previous prime is 111221102112091. The next prime is 111221102112139. The reversal of 111221102112121 is 121211201122111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104158455698025 + 7062646414096 = 10205805^2 + 2657564^2 .

It is a cyclic number.

It is not a de Polignac number, because 111221102112121 - 2¹¹ = 111221102110073 is a prime.

It is not a weakly prime, because it can be changed into another prime (111221102112181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610551056060 + 55610551056061.

It is an arithmetic number, because the mean of its divisors is an integer number (55610551056061).

Almost surely, 2^{111221102112121} is an apocalyptic number.

It is an amenable number.

111221102112121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221102112121 is an equidigital number, since it uses as much as digits as its factorization.

111221102112121 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 111221102112121 its reverse (121211201122111), we get a palindrome (232432303234232).

The spelling of 111221102112121 in words is "one hundred eleven trillion, two hundred twenty-one billion, one hundred two million, one hundred twelve thousand, one hundred twenty-one".