12111205 has 4 divisors (see below), whose sum is σ = 14533452. Its totient is φ = 9688960.

The previous prime is 12111199. The next prime is 12111217. The reversal of 12111205 is 50211121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50211121 = 131 ⋅383291.

It can be written as a sum of positive squares in 2 ways, for example, as 1240996 + 10870209 = 1114^2 + 3297^2 .

It is not a de Polignac number, because 12111205 - 2¹¹ = 12109157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1211116 + ... + 1211125.

It is an arithmetic number, because the mean of its divisors is an integer number (3633363).

Almost surely, 2^12111205 is an apocalyptic number.

It is an amenable number.

12111205 is a deficient number, since it is larger than the sum of its proper divisors (2422247).

12111205 is an equidigital number, since it uses as much as digits as its factorization.

12111205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2422246.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 12111205 is about 3480.1156589976. The cubic root of 12111205 is about 229.6478859135.

Adding to 12111205 its reverse (50211121), we get a palindrome (62322326).

The spelling of 12111205 in words is "twelve million, one hundred eleven thousand, two hundred five".