21283 has 2 divisors, whose sum is σ = 21284.
Its totient is φ = 21282.
The previous prime is 21277. The next prime is 21313. The reversal of 21283 is 38212.
Adding to 21283 its reverse (38212), we get a palindrome (59495).
It is a happy number.
It is a weak prime.
21283 is a truncatable prime.
It is a cyclic number.
It is not a de Polignac number, because 21283 - 29 = 20771 is a prime.
It is not a weakly prime, because it can be changed into another prime (21383) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10641 + 10642.
It is an arithmetic number, because the mean of its divisors is an integer number (10642).
221283 is an apocalyptic number.
21283 is a deficient number, since it is larger than the sum of its proper divisors (1).
21283 is an equidigital number, since it uses as much as digits as its factorization.
21283 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 96, while the sum is 16.
The square root of 21283 is about 145.8869425274.
The cubic root of 21283 is about 27.7126218072.
The spelling of 21283 in words is "twenty-one thousand, two hundred eighty-three".