11189021 has 4 divisors (see below), whose sum is σ = 11195712. Its totient is φ = 11182332.

The previous prime is 11188997. The next prime is 11189027. The reversal of 11189021 is 12098111.

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 a de Polignac number, because none of the positive numbers 2^k-11189021 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 (11189027) 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, 1670 + ... + 5016.

It is an arithmetic number, because the mean of its divisors is an integer number (2798928).

Almost surely, 2^11189021 is an apocalyptic number.

It is an amenable number.

11189021 is a deficient number, since it is larger than the sum of its proper divisors (6691).

11189021 is an equidigital number, since it uses as much as digits as its factorization.

11189021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6690.

The product of its (nonzero) digits is 144, while the sum is 23.

The square root of 11189021 is about 3344.9994020926. Note that the first 3 decimals coincide. The cubic root of 11189021 is about 223.6646568608.

The spelling of 11189021 in words is "eleven million, one hundred eighty-nine thousand, twenty-one".