22135865 has 4 divisors (see below), whose sum is σ = 26563044. Its totient is φ = 17708688.

The previous prime is 22135849. The next prime is 22135871. The reversal of 22135865 is 56853122.

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 2493241 + 19642624 = 1579^2 + 4432^2 .

It is a cyclic number.

It is not a de Polignac number, because 22135865 - 2⁴ = 22135849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2213582 + ... + 2213591.

It is an arithmetic number, because the mean of its divisors is an integer number (6640761).

Almost surely, 2^22135865 is an apocalyptic number.

It is an amenable number.

22135865 is a deficient number, since it is larger than the sum of its proper divisors (4427179).

22135865 is an equidigital number, since it uses as much as digits as its factorization.

22135865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4427178.

The product of its digits is 14400, while the sum is 32.

The square root of 22135865 is about 4704.8767252713. The cubic root of 22135865 is about 280.7795664888.

Adding to 22135865 its reverse (56853122), we get a palindrome (78988987).

The spelling of 22135865 in words is "twenty-two million, one hundred thirty-five thousand, eight hundred sixty-five".