21227 has 2 divisors, whose sum is σ = 21228. Its totient is φ = 21226.

The previous prime is 21221. The next prime is 21247. The reversal of 21227 is 72212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21227 - 2⁴ = 21211 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613 + 10614.

It is an arithmetic number, because the mean of its divisors is an integer number (10614).

2²¹²²⁷ is an apocalyptic number.

21227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21227 is an equidigital number, since it uses as much as digits as its factorization.

21227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56, while the sum is 14.

The square root of 21227 is about 145.6948866639. The cubic root of 21227 is about 27.6882945672.

Adding to 21227 its reverse (72212), we get a palindrome (93439).

The spelling of 21227 in words is "twenty-one thousand, two hundred twenty-seven", and thus it is an iban number.