11821105 has 4 divisors (see below), whose sum is σ = 14185332. Its totient is φ = 9456880.

The previous prime is 11821081. The next prime is 11821123. The reversal of 11821105 is 50112811.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50112811 = 7 ⋅7158973.

It can be written as a sum of positive squares in 2 ways, for example, as 6640929 + 5180176 = 2577^2 + 2276^2 .

It is a de Polignac number, because none of the positive numbers 2^k-11821105 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1182106 + ... + 1182115.

It is an arithmetic number, because the mean of its divisors is an integer number (3546333).

Almost surely, 2^11821105 is an apocalyptic number.

It is an amenable number.

11821105 is a deficient number, since it is larger than the sum of its proper divisors (2364227).

11821105 is an equidigital number, since it uses as much as digits as its factorization.

11821105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364226.

The product of its (nonzero) digits is 80, while the sum is 19.

The square root of 11821105 is about 3438.1833866157. The cubic root of 11821105 is about 227.7994607336.

Adding to 11821105 its reverse (50112811), we get a palindrome (61933916).

The spelling of 11821105 in words is "eleven million, eight hundred twenty-one thousand, one hundred five".