11285821 has 4 divisors (see below), whose sum is σ = 11334492. Its totient is φ = 11237152.

The previous prime is 11285809. The next prime is 11285831. The reversal of 11285821 is 12858211.

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 3367225 + 7918596 = 1835^2 + 2814^2 .

It is a cyclic number.

It is not a de Polignac number, because 11285821 - 2¹⁷ = 11154749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11285821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11285831) 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, 23986 + ... + 24451.

It is an arithmetic number, because the mean of its divisors is an integer number (2833623).

Almost surely, 2^11285821 is an apocalyptic number.

It is an amenable number.

11285821 is a deficient number, since it is larger than the sum of its proper divisors (48671).

11285821 is an equidigital number, since it uses as much as digits as its factorization.

11285821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48670.

The product of its digits is 1280, while the sum is 28.

The square root of 11285821 is about 3359.4376017423. The cubic root of 11285821 is about 224.3078052112.

The spelling of 11285821 in words is "eleven million, two hundred eighty-five thousand, eight hundred twenty-one".