11217 has 4 divisors (see below), whose sum is σ = 14960. Its totient is φ = 7476.

The previous prime is 11213. The next prime is 11239. The reversal of 11217 is 71211.

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 not a de Polignac number, because 11217 - 2² = 11213 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

11217 is a lucky number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (11213) 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, 1867 + ... + 1872.

It is an arithmetic number, because the mean of its divisors is an integer number (3740).

2¹¹²¹⁷ is an apocalyptic number.

It is an amenable number.

11217 is a deficient number, since it is larger than the sum of its proper divisors (3743).

11217 is an equidigital number, since it uses as much as digits as its factorization.

11217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3742.

The product of its digits is 14, while the sum is 12.

The square root of 11217 is about 105.9103394386. The cubic root of 11217 is about 22.3850931857.

Adding to 11217 its reverse (71211), we get a palindrome (82428).

It can be divided in two parts, 1121 and 7, that added together give a triangular number (1128 = T₄₇).

The spelling of 11217 in words is "eleven thousand, two hundred seventeen", and thus it is an iban number.