11221805 has 16 divisors (see below), whose sum is σ = 15444864. Its totient is φ = 7667520.

The previous prime is 11221789. The next prime is 11221829. The reversal of 11221805 is 50812211.

It is a happy number.

It is not a de Polignac number, because 11221805 - 2⁴ = 11221789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16859 + ... + 17511.

It is an arithmetic number, because the mean of its divisors is an integer number (965304).

Almost surely, 2^11221805 is an apocalyptic number.

It is an amenable number.

11221805 is a deficient number, since it is larger than the sum of its proper divisors (4223059).

11221805 is an equidigital number, since it uses as much as digits as its factorization.

11221805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 11221805 is about 3349.8962670507. The cubic root of 11221805 is about 223.8828907939.

The spelling of 11221805 in words is "eleven million, two hundred twenty-one thousand, eight hundred five".