218011 has 4 divisors (see below), whose sum is σ = 219024. Its totient is φ = 217000.

The previous prime is 218003. The next prime is 218021. The reversal of 218011 is 110812.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 218011 - 2³ = 218003 is a prime.

It is a super-2 number, since 2×218011² = 95057592242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217982 and 218000.

It is not an unprimeable number, because it can be changed into a prime (218021) 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, 40 + ... + 661.

It is an arithmetic number, because the mean of its divisors is an integer number (54756).

2²¹⁸⁰¹¹ is an apocalyptic number.

218011 is a deficient number, since it is larger than the sum of its proper divisors (1013).

218011 is an equidigital number, since it uses as much as digits as its factorization.

218011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 218011 is about 466.9164807543. The cubic root of 218011 is about 60.1856288105.

Adding to 218011 its reverse (110812), we get a palindrome (328823).

The spelling of 218011 in words is "two hundred eighteen thousand, eleven".