5221 has 4 divisors (see below), whose sum is σ = 5472.
Its totient is φ = 4972.
The previous prime is 5209. The next prime is 5227. The reversal of 5221 is 1225.
Adding to 5221 its reverse (1225), we get a palindrome (6446).
It is the 30-th star number.
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 a cyclic number.
It is not a de Polignac number, because 5221 - 25 = 5189 is a prime.
It is a Duffinian number.
It is a nialpdrome in base 10.
It is a junction number, because it is equal to n+sod(n) for n = 5198 and 5207.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (5227) 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, 91 + ... + 136.
It is an arithmetic number, because the mean of its divisors is an integer number (1368).
5221 is the 46-th heptagonal number.
It is an amenable number.
5221 is a deficient number, since it is larger than the sum of its proper divisors (251).
5221 is a wasteful number, since it uses less digits than its factorization.
5221 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 250.
The product of its digits is 20, while the sum is 10.
The square root of 5221 is about 72.2564875980.
The cubic root of 5221 is about 17.3480726044.
The spelling of 5221 in words is "five thousand, two hundred twenty-one".