11786221 has 4 divisors (see below), whose sum is σ = 11793600. Its totient is φ = 11778844.

The previous prime is 11786197. The next prime is 11786233. The reversal of 11786221 is 12268711.

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 11786221 - 2¹¹ = 11784173 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11786221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11786261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181 + ... + 4858.

It is an arithmetic number, because the mean of its divisors is an integer number (2948400).

Almost surely, 2^11786221 is an apocalyptic number.

It is an amenable number.

11786221 is a deficient number, since it is larger than the sum of its proper divisors (7379).

11786221 is an equidigital number, since it uses as much as digits as its factorization.

11786221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7378.

The product of its digits is 1344, while the sum is 28.

The square root of 11786221 is about 3433.1066106371. The cubic root of 11786221 is about 227.5751617369.

The spelling of 11786221 in words is "eleven million, seven hundred eighty-six thousand, two hundred twenty-one".