21683227 has 4 divisors (see below), whose sum is σ = 22626000. Its totient is φ = 20740456.

The previous prime is 21683203. The next prime is 21683287. The reversal of 21683227 is 72238612.

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 21683227 - 2⁷ = 21683099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21683287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471352 + ... + 471397.

It is an arithmetic number, because the mean of its divisors is an integer number (5656500).

Almost surely, 2^21683227 is an apocalyptic number.

21683227 is a deficient number, since it is larger than the sum of its proper divisors (942773).

21683227 is an equidigital number, since it uses as much as digits as its factorization.

21683227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942772.

The product of its digits is 8064, while the sum is 31.

The square root of 21683227 is about 4656.5252066321. The cubic root of 21683227 is about 278.8525618826.

The spelling of 21683227 in words is "twenty-one million, six hundred eighty-three thousand, two hundred twenty-seven".