216213 has 8 divisors (see below), whose sum is σ = 291648. Its totient is φ = 142464.
The previous prime is 216211. The next prime is 216217. The reversal of 216213 is 312612.
216213 is digitally balanced in base 2 and base 7, because in such bases it contains all the possibile digits an equal number of times.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 216213 - 21 = 216211 is a prime.
It is a super-2 number, since 2×2162132 = 93496122738, which contains 22 as substring.
216213 is strictly pandigital in base 7.
It is a junction number, because it is equal to n+sod(n) for n = 216192 and 216201.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (216211) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81 + ... + 662.
It is an arithmetic number, because the mean of its divisors is an integer number (36456).
2216213 is an apocalyptic number.
It is an amenable number.
216213 is a deficient number, since it is larger than the sum of its proper divisors (75435).
216213 is an equidigital number, since it uses as much as digits as its factorization.
216213 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 843.
The product of its digits is 72, while the sum is 15.
The square root of 216213 is about 464.9870965952. The cubic root of 216213 is about 60.0197157430.
Adding to 216213 its reverse (312612), we get a palindrome (528825).
The spelling of 216213 in words is "two hundred sixteen thousand, two hundred thirteen".
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