221318 has 8 divisors (see below), whose sum is σ = 340200. Its totient is φ = 107920.

The previous prime is 221317. The next prime is 221327. The reversal of 221318 is 813122.

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

It is a junction number, because it is equal to n+sod(n) for n = 221296 and 221305.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 221318.

It is not an unprimeable number, because it can be changed into a prime (221311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1268 + ... + 1431.

It is an arithmetic number, because the mean of its divisors is an integer number (42525).

2²²¹³¹⁸ is an apocalyptic number.

221318 is a deficient number, since it is larger than the sum of its proper divisors (118882).

221318 is a wasteful number, since it uses less digits than its factorization.

221318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2742.

The product of its digits is 96, while the sum is 17.

The square root of 221318 is about 470.4444706870. Note that the first 4 decimals coincide. The cubic root of 221318 is about 60.4884207059.

The spelling of 221318 in words is "two hundred twenty-one thousand, three hundred eighteen".