22221305 has 4 divisors (see below), whose sum is σ = 26665572. Its totient is φ = 17777040.

The previous prime is 22221299. The next prime is 22221307. The reversal of 22221305 is 50312222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50312222 = 2 ⋅25156111.

It can be written as a sum of positive squares in 2 ways, for example, as 16949689 + 5271616 = 4117^2 + 2296^2 .

It is not a de Polignac number, because 22221305 - 2⁸ = 22221049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22221307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2222126 + ... + 2222135.

It is an arithmetic number, because the mean of its divisors is an integer number (6666393).

Almost surely, 2^22221305 is an apocalyptic number.

It is an amenable number.

22221305 is a deficient number, since it is larger than the sum of its proper divisors (4444267).

22221305 is an equidigital number, since it uses as much as digits as its factorization.

22221305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4444266.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 22221305 is about 4713.9479207984. The cubic root of 22221305 is about 281.1403536381.

Adding to 22221305 its reverse (50312222), we get a palindrome (72533527).

The spelling of 22221305 in words is "twenty-two million, two hundred twenty-one thousand, three hundred five".