11189921 has 4 divisors (see below), whose sum is σ = 11196672. Its totient is φ = 11183172.

The previous prime is 11189909. The next prime is 11189923. The reversal of 11189921 is 12998111.

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 11189921 - 2¹⁰ = 11188897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11189923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1016 + ... + 4838.

It is an arithmetic number, because the mean of its divisors is an integer number (2799168).

Almost surely, 2^11189921 is an apocalyptic number.

It is an amenable number.

11189921 is a deficient number, since it is larger than the sum of its proper divisors (6751).

11189921 is an equidigital number, since it uses as much as digits as its factorization.

11189921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6750.

The product of its digits is 1296, while the sum is 32.

The square root of 11189921 is about 3345.1339285595. The cubic root of 11189921 is about 223.6706535961.

The spelling of 11189921 in words is "eleven million, one hundred eighty-nine thousand, nine hundred twenty-one".