218103 has 4 divisors (see below), whose sum is σ = 290808. Its totient is φ = 145400.

The previous prime is 218087. The next prime is 218107. The reversal of 218103 is 301812.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 218103 - 2⁴ = 218087 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218107) 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 3 ways as a sum of consecutive naturals, for example, 36348 + ... + 36353.

It is an arithmetic number, because the mean of its divisors is an integer number (72702).

2²¹⁸¹⁰³ is an apocalyptic number.

218103 is a deficient number, since it is larger than the sum of its proper divisors (72705).

218103 is an equidigital number, since it uses as much as digits as its factorization.

218103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72704.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 218103 is about 467.0149890528. The cubic root of 218103 is about 60.1940936726.

Adding to 218103 its reverse (301812), we get a palindrome (519915).

The spelling of 218103 in words is "two hundred eighteen thousand, one hundred three".