11189821 has 2 divisors, whose sum is σ = 11189822. Its totient is φ = 11189820.

The previous prime is 11189819. The next prime is 11189833. The reversal of 11189821 is 12898111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10169721 + 1020100 = 3189^2 + 1010^2 .

It is an emirp because it is prime and its reverse (12898111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11189821 - 2¹ = 11189819 is a prime.

Together with 11189819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11189851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5594910 + 5594911.

It is an arithmetic number, because the mean of its divisors is an integer number (5594911).

Almost surely, 2^11189821 is an apocalyptic number.

It is an amenable number.

11189821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11189821 is an equidigital number, since it uses as much as digits as its factorization.

11189821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 31.

The square root of 11189821 is about 3345.1189814415. The cubic root of 11189821 is about 223.6699873081.

The spelling of 11189821 in words is "eleven million, one hundred eighty-nine thousand, eight hundred twenty-one".