11221565 has 16 divisors (see below), whose sum is σ = 13789440. Its totient is φ = 8764800.

The previous prime is 11221559. The next prime is 11221601. The reversal of 11221565 is 56512211.

It is a happy number.

It is not a de Polignac number, because 11221565 - 2⁴ = 11221549 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11221565.

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, 67112 + ... + 67278.

It is an arithmetic number, because the mean of its divisors is an integer number (861840).

Almost surely, 2^11221565 is an apocalyptic number.

It is an amenable number.

11221565 is a deficient number, since it is larger than the sum of its proper divisors (2567875).

11221565 is a wasteful number, since it uses less digits than its factorization.

11221565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412.

The product of its digits is 600, while the sum is 23.

The square root of 11221565 is about 3349.8604448544. The cubic root of 11221565 is about 223.8812947263.

Adding to 11221565 its reverse (56512211), we get a palindrome (67733776).

The spelling of 11221565 in words is "eleven million, two hundred twenty-one thousand, five hundred sixty-five".