22216555 has 4 divisors (see below), whose sum is σ = 26659872. Its totient is φ = 17773240.

The previous prime is 22216549. The next prime is 22216561. The reversal of 22216555 is 55561222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55561222 = 2 ⋅27780611.

It is an interprime number because it is at equal distance from previous prime (22216549) and next prime (22216561).

It is not a de Polignac number, because 22216555 - 2⁹ = 22216043 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2221651 + ... + 2221660.

It is an arithmetic number, because the mean of its divisors is an integer number (6664968).

Almost surely, 2^22216555 is an apocalyptic number.

22216555 is a deficient number, since it is larger than the sum of its proper divisors (4443317).

22216555 is an equidigital number, since it uses as much as digits as its factorization.

22216555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4443316.

The product of its digits is 6000, while the sum is 28.

The square root of 22216555 is about 4713.4440698920. Note that the first 3 decimals coincide. The cubic root of 22216555 is about 281.1203201336.

Adding to 22216555 its reverse (55561222), we get a palindrome (77777777).

The spelling of 22216555 in words is "twenty-two million, two hundred sixteen thousand, five hundred fifty-five".