121112111 has 2 divisors, whose sum is σ = 121112112. Its totient is φ = 121112110.

The previous prime is 121112107. The next prime is 121112113. The reversal of 121112111 is 111211121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121112111 - 2² = 121112107 is a prime.

Together with 121112113, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 121112092 and 121112101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121112113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60556055 + 60556056.

It is an arithmetic number, because the mean of its divisors is an integer number (60556056).

Almost surely, 2^121112111 is an apocalyptic number.

121112111 is a deficient number, since it is larger than the sum of its proper divisors (1).

121112111 is an equidigital number, since it uses as much as digits as its factorization.

121112111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4, while the sum is 11.

The square root of 121112111 is about 11005.0947746941. The cubic root of 121112111 is about 494.7614549693.

Adding to 121112111 its reverse (111211121), we get a palindrome (232323232).

It can be divided in two parts, 1211121 and 11, that multiplied together give a palindrome (13322331).

The spelling of 121112111 in words is "one hundred twenty-one million, one hundred twelve thousand, one hundred eleven".