22205561 has 8 divisors (see below), whose sum is σ = 26253120. Its totient is φ = 18376848.

The previous prime is 22205549. The next prime is 22205563. The reversal of 22205561 is 16550222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22205561 - 2⁶ = 22205497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22205563) 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 7 ways as a sum of consecutive naturals, for example, 54491 + ... + 54896.

It is an arithmetic number, because the mean of its divisors is an integer number (3281640).

Almost surely, 2^22205561 is an apocalyptic number.

It is an amenable number.

22205561 is a deficient number, since it is larger than the sum of its proper divisors (4047559).

22205561 is a wasteful number, since it uses less digits than its factorization.

22205561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109423.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 22205561 is about 4712.2776870639. The cubic root of 22205561 is about 281.0739411046.

Adding to 22205561 its reverse (16550222), we get a palindrome (38755783).

The spelling of 22205561 in words is "twenty-two million, two hundred five thousand, five hundred sixty-one".