21163 has 2 divisors, whose sum is σ = 21164.
Its totient is φ = 21162.
The previous prime is 21157. The next prime is 21169. The reversal of 21163 is 36112.
Adding to 21163 its reverse (36112), we get a palindrome (57275).
It is a balanced prime because it is at equal distance from previous prime (21157) and next prime (21169).
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-21163 is a prime.
It is a plaindrome in base 11.
It is not a weakly prime, because it can be changed into another prime (21169) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581 + 10582.
It is an arithmetic number, because the mean of its divisors is an integer number (10582).
221163 is an apocalyptic number.
21163 is a deficient number, since it is larger than the sum of its proper divisors (1).
21163 is an equidigital number, since it uses as much as digits as its factorization.
21163 is an evil number, because the sum of its binary digits is even.
The product of its digits is 36, while the sum is 13.
The square root of 21163 is about 145.4750837773.
The cubic root of 21163 is about 27.6604395592.
The spelling of 21163 in words is "twenty-one thousand, one hundred sixty-three".