21844271 has 2 divisors, whose sum is σ = 21844272. Its totient is φ = 21844270.

The previous prime is 21844261. The next prime is 21844289. The reversal of 21844271 is 17244812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21844271 - 2¹⁰ = 21843247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21844241) 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 as a sum of consecutive naturals, namely, 10922135 + 10922136.

It is an arithmetic number, because the mean of its divisors is an integer number (10922136).

Almost surely, 2^21844271 is an apocalyptic number.

21844271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21844271 is an equidigital number, since it uses as much as digits as its factorization.

21844271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584, while the sum is 29.

The square root of 21844271 is about 4673.7855106969. The cubic root of 21844271 is about 279.5412172279.

The spelling of 21844271 in words is "twenty-one million, eight hundred forty-four thousand, two hundred seventy-one".