121110111121 has 2 divisors, whose sum is σ = 121110111122. Its totient is φ = 121110111120.

The previous prime is 121110111119. The next prime is 121110111173. The reversal of 121110111121 is 121111011121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109355214721 + 11754896400 = 330689^2 + 108420^2 .

It is a cyclic number.

It is not a de Polignac number, because 121110111121 - 2¹ = 121110111119 is a prime.

Together with 121110111119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (121110118121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555055560 + 60555055561.

It is an arithmetic number, because the mean of its divisors is an integer number (60555055561).

Almost surely, 2^121110111121 is an apocalyptic number.

It is an amenable number.

121110111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121110111121 is an equidigital number, since it uses as much as digits as its factorization.

121110111121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 121110111121 its reverse (121111011121), we get a palindrome (242221122242).

The spelling of 121110111121 in words is "one hundred twenty-one billion, one hundred ten million, one hundred eleven thousand, one hundred twenty-one".