111121 has 2 divisors, whose sum is σ = 111122.
Its totient is φ = 111120.
The previous prime is 111119. The next prime is 111127. The reversal of 111121 is 121111.
Adding to 111121 its reverse (121111), we get a palindrome (232232).
Multipling 111121 by its reverse (121111), we get a palindrome (13457975431).
It can be divided in two parts, 111 and 121, that multiplied together give a palindrome (13431).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 96721 + 14400 = 311^2 + 120^2
It is a cyclic number.
It is not a de Polignac number, because 111121 - 21 = 111119 is a prime.
Together with 111119, it forms a pair of twin primes.
It is not a weakly prime, because it can be changed into another prime (111127) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55560 + 55561.
It is an arithmetic number, because the mean of its divisors is an integer number (55561).
2111121 is an apocalyptic number.
It is an amenable number.
111121 is a deficient number, since it is larger than the sum of its proper divisors (1).
111121 is an equidigital number, since it uses as much as digits as its factorization.
111121 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 2, while the sum is 7.
The square root of 111121 is about 333.3481663366.
The cubic root of 111121 is about 48.0764118592.
The spelling of 111121 in words is "one hundred eleven thousand, one hundred twenty-one", and thus it is an iban number.