11185221 has 4 divisors (see below), whose sum is σ = 14913632. Its totient is φ = 7456812.

The previous prime is 11185183. The next prime is 11185231. The reversal of 11185221 is 12258111.

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.

It is not a de Polignac number, because 11185221 - 2⁶ = 11185157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11185231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1864201 + ... + 1864206.

It is an arithmetic number, because the mean of its divisors is an integer number (3728408).

Almost surely, 2^11185221 is an apocalyptic number.

It is an amenable number.

11185221 is a deficient number, since it is larger than the sum of its proper divisors (3728411).

11185221 is an equidigital number, since it uses as much as digits as its factorization.

11185221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3728410.

The product of its digits is 160, while the sum is 21.

The square root of 11185221 is about 3344.4313417979. The cubic root of 11185221 is about 223.6393337656.

The spelling of 11185221 in words is "eleven million, one hundred eighty-five thousand, two hundred twenty-one".