22205555 has 4 divisors (see below), whose sum is σ = 26646672. Its totient is φ = 17764440.

The previous prime is 22205549. The next prime is 22205563. The reversal of 22205555 is 55550222.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 22205555 - 2¹⁰ = 22204531 is a prime.

It is a Duffinian number.

22205555 is a modest number, since divided by 5555 gives 2220 as remainder.

It is an unprimeable number.

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, 2220551 + ... + 2220560.

It is an arithmetic number, because the mean of its divisors is an integer number (6661668).

Almost surely, 2^22205555 is an apocalyptic number.

22205555 is a deficient number, since it is larger than the sum of its proper divisors (4441117).

22205555 is an equidigital number, since it uses as much as digits as its factorization.

22205555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4441116.

The product of its (nonzero) digits is 5000, while the sum is 26.

The square root of 22205555 is about 4712.2770504290. The cubic root of 22205555 is about 281.0739157889.

Adding to 22205555 its reverse (55550222), we get a palindrome (77755777).

The spelling of 22205555 in words is "twenty-two million, two hundred five thousand, five hundred fifty-five".