11821133 has 4 divisors (see below), whose sum is σ = 11828448. Its totient is φ = 11813820.

The previous prime is 11821127. The next prime is 11821151. The reversal of 11821133 is 33112811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11821133 - 2²⁰ = 10772557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11821123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41 + ... + 4862.

It is an arithmetic number, because the mean of its divisors is an integer number (2957112).

Almost surely, 2^11821133 is an apocalyptic number.

It is an amenable number.

11821133 is a deficient number, since it is larger than the sum of its proper divisors (7315).

11821133 is an equidigital number, since it uses as much as digits as its factorization.

11821133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7314.

The product of its digits is 144, while the sum is 20.

The square root of 11821133 is about 3438.1874585310. The cubic root of 11821133 is about 227.7996405921.

Adding to 11821133 its reverse (33112811), we get a palindrome (44933944).

The spelling of 11821133 in words is "eleven million, eight hundred twenty-one thousand, one hundred thirty-three".