11153221 has 4 divisors (see below), whose sum is σ = 11233600. Its totient is φ = 11072844.

The previous prime is 11153201. The next prime is 11153227. The reversal of 11153221 is 12235111.

11153221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11153221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11153195 and 11153204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11153227) 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, 39981 + ... + 40258.

It is an arithmetic number, because the mean of its divisors is an integer number (2808400).

Almost surely, 2^11153221 is an apocalyptic number.

It is an amenable number.

11153221 is a deficient number, since it is larger than the sum of its proper divisors (80379).

11153221 is an equidigital number, since it uses as much as digits as its factorization.

11153221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80378.

The product of its digits is 60, while the sum is 16.

The square root of 11153221 is about 3339.6438432863. The cubic root of 11153221 is about 223.4258587933.

Adding to 11153221 its reverse (12235111), we get a palindrome (23388332).

The spelling of 11153221 in words is "eleven million, one hundred fifty-three thousand, two hundred twenty-one".