218220005 has 16 divisors (see below), whose sum is σ = 274358784. Its totient is φ = 166415040.

The previous prime is 218220001. The next prime is 218220019. The reversal of 218220005 is 500022812.

It is not a de Polignac number, because 218220005 - 2² = 218220001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218220001) 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 15 ways as a sum of consecutive naturals, for example, 122 + ... + 20891.

It is an arithmetic number, because the mean of its divisors is an integer number (17147424).

Almost surely, 2^218220005 is an apocalyptic number.

It is an amenable number.

218220005 is a deficient number, since it is larger than the sum of its proper divisors (56138779).

218220005 is a wasteful number, since it uses less digits than its factorization.

218220005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21116.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 218220005 is about 14772.2714908710. The cubic root of 218220005 is about 602.0485579092.

Adding to 218220005 its reverse (500022812), we get a palindrome (718242817).

The spelling of 218220005 in words is "two hundred eighteen million, two hundred twenty thousand, five".