11081821 has 4 divisors (see below), whose sum is σ = 11191644. Its totient is φ = 10972000.

The previous prime is 11081803. The next prime is 11081827. The reversal of 11081821 is 12818011.

11081821 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 10150596 + 931225 = 3186^2 + 965^2 .

It is a cyclic number.

It is not a de Polignac number, because 11081821 - 2⁵ = 11081789 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11081792 and 11081801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11081827) 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, 54760 + ... + 54961.

It is an arithmetic number, because the mean of its divisors is an integer number (2797911).

Almost surely, 2^11081821 is an apocalyptic number.

It is an amenable number.

11081821 is a deficient number, since it is larger than the sum of its proper divisors (109823).

11081821 is a wasteful number, since it uses less digits than its factorization.

11081821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109822.

The product of its (nonzero) digits is 128, while the sum is 22.

The square root of 11081821 is about 3328.9369173957. The cubic root of 11081821 is about 222.9480664923.

Adding to 11081821 its reverse (12818011), we get a palindrome (23899832).

The spelling of 11081821 in words is "eleven million, eighty-one thousand, eight hundred twenty-one".