11215 has 4 divisors (see below), whose sum is σ = 13464.
Its totient is φ = 8968.
The previous prime is 11213. The next prime is 11239. The reversal of 11215 is 51211.
Adding to 11215 its reverse (51211), we get a palindrome (62426).
11215 = 202 + 212 + ... + 342.
It is a happy number.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51211 = 83 ⋅617.
It is a cyclic number.
It is not a de Polignac number, because 11215 - 21 = 11213 is a prime.
It is a Duffinian number.
It is a plaindrome in base 16.
It is a congruent number.
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, 1117 + ... + 1126.
It is an arithmetic number, because the mean of its divisors is an integer number (3366).
211215 is an apocalyptic number.
11215 is a deficient number, since it is larger than the sum of its proper divisors (2249).
11215 is an equidigital number, since it uses as much as digits as its factorization.
11215 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2248.
The product of its digits is 10, while the sum is 10.
The square root of 11215 is about 105.9008970689.
The cubic root of 11215 is about 22.3837626800.
The spelling of 11215 in words is "eleven thousand, two hundred fifteen".