21744269 has 8 divisors (see below), whose sum is σ = 22809600. Its totient is φ = 20688976.

The previous prime is 21744263. The next prime is 21744277. The reversal of 21744269 is 96244712.

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 21744269 - 2⁴ = 21744253 is a prime.

It is a super-2 number, since 2×21744269² = 945626468688722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21744263) 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 7 ways as a sum of consecutive naturals, for example, 2132 + ... + 6930.

It is an arithmetic number, because the mean of its divisors is an integer number (2851200).

Almost surely, 2^21744269 is an apocalyptic number.

It is an amenable number.

21744269 is a deficient number, since it is larger than the sum of its proper divisors (1065331).

21744269 is a wasteful number, since it uses less digits than its factorization.

21744269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5019.

The product of its digits is 24192, while the sum is 35.

The square root of 21744269 is about 4663.0750583708. The cubic root of 21744269 is about 279.1139892983.

The spelling of 21744269 in words is "twenty-one million, seven hundred forty-four thousand, two hundred sixty-nine".