316221 has 4 divisors (see below), whose sum is σ = 421632. Its totient is φ = 210812.

The previous prime is 316219. The next prime is 316223. The reversal of 316221 is 122613.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (316219) and next prime (316223).

It is a cyclic number.

It is not a de Polignac number, because 316221 - 2¹ = 316219 is a prime.

It is a D-number.

316221 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 316221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (316223) 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, 52701 + ... + 52706.

It is an arithmetic number, because the mean of its divisors is an integer number (105408).

2³¹⁶²²¹ is an apocalyptic number.

It is an amenable number.

316221 is a deficient number, since it is larger than the sum of its proper divisors (105411).

316221 is a wasteful number, since it uses less digits than its factorization.

316221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105410.

The product of its digits is 72, while the sum is 15.

The square root of 316221 is about 562.3353092240. The cubic root of 316221 is about 68.1287210043.

Adding to 316221 its reverse (122613), we get a palindrome (438834).

The spelling of 316221 in words is "three hundred sixteen thousand, two hundred twenty-one".