217213 has 4 divisors (see below), whose sum is σ = 218268. Its totient is φ = 216160.

The previous prime is 217207. The next prime is 217219. The reversal of 217213 is 312712.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (217207) and next prime (217219).

It can be written as a sum of positive squares in 2 ways, for example, as 71289 + 145924 = 267^2 + 382^2 .

It is a cyclic number.

It is not a de Polignac number, because 217213 - 2¹³ = 209021 is a prime.

It is a Duffinian number.

217213 is a lucky number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106 + ... + 667.

It is an arithmetic number, because the mean of its divisors is an integer number (54567).

2²¹⁷²¹³ is an apocalyptic number.

It is an amenable number.

217213 is a deficient number, since it is larger than the sum of its proper divisors (1055).

217213 is an equidigital number, since it uses as much as digits as its factorization.

217213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054.

The product of its digits is 84, while the sum is 16.

The square root of 217213 is about 466.0611547855. The cubic root of 217213 is about 60.1121052247.

Adding to 217213 its reverse (312712), we get a palindrome (529925).

The spelling of 217213 in words is "two hundred seventeen thousand, two hundred thirteen".