12111005 has 4 divisors (see below), whose sum is σ = 14533212. Its totient is φ = 9688800.

The previous prime is 12110971. The next prime is 12111017. The reversal of 12111005 is 50011121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50011121 = 331 ⋅151091.

It can be written as a sum of positive squares in 2 ways, for example, as 1214404 + 10896601 = 1102^2 + 3301^2 .

It is not a de Polignac number, because 12111005 - 2¹⁸ = 11848861 is a prime.

It is a super-2 number, since 2×12111005² = 293352884220050, which contains 22 as substring.

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, 1211096 + ... + 1211105.

It is an arithmetic number, because the mean of its divisors is an integer number (3633303).

Almost surely, 2^12111005 is an apocalyptic number.

It is an amenable number.

12111005 is a deficient number, since it is larger than the sum of its proper divisors (2422207).

12111005 is an equidigital number, since it uses as much as digits as its factorization.

12111005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2422206.

The product of its (nonzero) digits is 10, while the sum is 11.

The square root of 12111005 is about 3480.0869242018. The cubic root of 12111005 is about 229.6466217995.

Adding to 12111005 its reverse (50011121), we get a palindrome (62122126).

The spelling of 12111005 in words is "twelve million, one hundred eleven thousand, five".