11221865 has 8 divisors (see below), whose sum is σ = 13687368. Its totient is φ = 8830080.

The previous prime is 11221843. The next prime is 11221883. The reversal of 11221865 is 56812211.

It can be written as a sum of positive squares in 4 ways, for example, as 652864 + 10569001 = 808^2 + 3251^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11221865 - 2¹⁰ = 11220841 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18092 + ... + 18701.

It is an arithmetic number, because the mean of its divisors is an integer number (1710921).

Almost surely, 2^11221865 is an apocalyptic number.

It is an amenable number.

11221865 is a deficient number, since it is larger than the sum of its proper divisors (2465503).

11221865 is an equidigital number, since it uses as much as digits as its factorization.

11221865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36859.

The product of its digits is 960, while the sum is 26.

The square root of 11221865 is about 3349.9052225399. The cubic root of 11221865 is about 223.8832898072.

The spelling of 11221865 in words is "eleven million, two hundred twenty-one thousand, eight hundred sixty-five".