21744271 has 8 divisors (see below), whose sum is σ = 22407840. Its totient is φ = 21084768.

The previous prime is 21744263. The next prime is 21744277. The reversal of 21744271 is 17244712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21744271 - 2³ = 21744263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21744277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12465 + ... + 14101.

It is an arithmetic number, because the mean of its divisors is an integer number (2800980).

Almost surely, 2^21744271 is an apocalyptic number.

21744271 is a deficient number, since it is larger than the sum of its proper divisors (663569).

21744271 is a wasteful number, since it uses less digits than its factorization.

21744271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2033.

The product of its digits is 3136, while the sum is 28.

The square root of 21744271 is about 4663.0752728216. The cubic root of 21744271 is about 279.1139978558.

Adding to 21744271 its reverse (17244712), we get a palindrome (38988983).

The spelling of 21744271 in words is "twenty-one million, seven hundred forty-four thousand, two hundred seventy-one".