11055821 has 6 divisors (see below), whose sum is σ = 12860910. Its totient is φ = 9476376.

The previous prime is 11055817. The next prime is 11055827. The reversal of 11055821 is 12855011.

11055821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11055625 + 196 = 3325^2 + 14^2 .

It is not a de Polignac number, because 11055821 - 2² = 11055817 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 (11055827) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 112766 + ... + 112863.

It is an arithmetic number, because the mean of its divisors is an integer number (2143485).

Almost surely, 2^11055821 is an apocalyptic number.

It is an amenable number.

11055821 is a deficient number, since it is larger than the sum of its proper divisors (1805089).

11055821 is an equidigital number, since it uses as much as digits as its factorization.

11055821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225643 (or 225636 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 11055821 is about 3325.0294735536. The cubic root of 11055821 is about 222.7735708330.

The spelling of 11055821 in words is "eleven million, fifty-five thousand, eight hundred twenty-one".