111102211212121 has 2 divisors, whose sum is σ = 111102211212122. Its totient is φ = 111102211212120.

The previous prime is 111102211212061. The next prime is 111102211212169. The reversal of 111102211212121 is 121212112201111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92401386654096 + 18700824558025 = 9612564^2 + 4324445^2 .

It is an emirp because it is prime and its reverse (121212112201111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111102211212121 - 2¹⁵ = 111102211179353 is a prime.

It is not a weakly prime, because it can be changed into another prime (111102211212191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55551105606060 + 55551105606061.

It is an arithmetic number, because the mean of its divisors is an integer number (55551105606061).

Almost surely, 2^{111102211212121} is an apocalyptic number.

It is an amenable number.

111102211212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111102211212121 is an equidigital number, since it uses as much as digits as its factorization.

111102211212121 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 111102211212121 its reverse (121212112201111), we get a palindrome (232314323413232).

The spelling of 111102211212121 in words is "one hundred eleven trillion, one hundred two billion, two hundred eleven million, two hundred twelve thousand, one hundred twenty-one".