22281065 has 4 divisors (see below), whose sum is σ = 26737284. Its totient is φ = 17824848.

The previous prime is 22281029. The next prime is 22281071. The reversal of 22281065 is 56018222.

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 8826841 + 13454224 = 2971^2 + 3668^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22281065 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2228102 + ... + 2228111.

It is an arithmetic number, because the mean of its divisors is an integer number (6684321).

Almost surely, 2^22281065 is an apocalyptic number.

It is an amenable number.

22281065 is a deficient number, since it is larger than the sum of its proper divisors (4456219).

22281065 is an equidigital number, since it uses as much as digits as its factorization.

22281065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4456218.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 22281065 is about 4720.2823008799. The cubic root of 22281065 is about 281.3921526662.

Adding to 22281065 its reverse (56018222), we get a palindrome (78299287).

The spelling of 22281065 in words is "twenty-two million, two hundred eighty-one thousand, sixty-five".