12100111 has 2 divisors, whose sum is σ = 12100112.
Its totient is φ = 12100110.
The previous prime is 12100097. The next prime is 12100159. The reversal of 12100111 is 11100121.
It is a weak prime.
It is an emirp because it is prime and its reverse (11100121) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 12100111 - 25 = 12100079 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 12100094 and 12100103.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (12100171) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6050055 + 6050056.
It is an arithmetic number, because the mean of its divisors is an integer number (6050056).
Almost surely, 212100111 is an apocalyptic number.
12100111 is a deficient number, since it is larger than the sum of its proper divisors (1).
12100111 is an equidigital number, since it uses as much as digits as its factorization.
12100111 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 2, while the sum is 7.
The square root of 12100111 is about 3478.5213812768.
The cubic root of 12100111 is about 229.5777444769.
Adding to 12100111 its reverse (11100121), we get a palindrome (23200232).
Multiplying 12100111 by its reverse (11100121), we get a palindrome (134312696213431).
The spelling of 12100111 in words is "twelve million, one hundred thousand, one hundred eleven".