22221005 has 4 divisors (see below), whose sum is σ = 26665212. Its totient is φ = 17776800.

The previous prime is 22220987. The next prime is 22221007. The reversal of 22221005 is 50012222.

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 3575881 + 18645124 = 1891^2 + 4318^2 .

It is not a de Polignac number, because 22221005 - 2¹⁴ = 22204621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221007) by changing a digit.

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, 2222096 + ... + 2222105.

It is an arithmetic number, because the mean of its divisors is an integer number (6666303).

Almost surely, 2^22221005 is an apocalyptic number.

It is an amenable number.

22221005 is a deficient number, since it is larger than the sum of its proper divisors (4444207).

22221005 is an equidigital number, since it uses as much as digits as its factorization.

22221005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4444206.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 22221005 is about 4713.9161002292. The cubic root of 22221005 is about 281.1390884486.

Adding to 22221005 its reverse (50012222), we get a palindrome (72233227).

The spelling of 22221005 in words is "twenty-two million, two hundred twenty-one thousand, five".