21883 has 4 divisors (see below), whose sum is σ = 22240. Its totient is φ = 21528.

The previous prime is 21881. The next prime is 21893. The reversal of 21883 is 38812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21883 - 2¹ = 21881 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (21881) 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, 60 + ... + 217.

It is an arithmetic number, because the mean of its divisors is an integer number (5560).

2²¹⁸⁸³ is an apocalyptic number.

21883 is a deficient number, since it is larger than the sum of its proper divisors (357).

21883 is an equidigital number, since it uses as much as digits as its factorization.

21883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356.

The product of its digits is 384, while the sum is 22.

The square root of 21883 is about 147.9290370414. The cubic root of 21883 is about 27.9706324742.

The spelling of 21883 in words is "twenty-one thousand, eight hundred eighty-three".