21744453 has 16 divisors (see below), whose sum is σ = 30468096. Its totient is φ = 13767600.

The previous prime is 21744451. The next prime is 21744467. The reversal of 21744453 is 35444712.

It is not a de Polignac number, because 21744453 - 2¹ = 21744451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21744453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21744451) 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 15 ways as a sum of consecutive naturals, for example, 9376 + ... + 11462.

It is an arithmetic number, because the mean of its divisors is an integer number (1904256).

Almost surely, 2^21744453 is an apocalyptic number.

21744453 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21744453 is a deficient number, since it is larger than the sum of its proper divisors (8723643).

21744453 is a wasteful number, since it uses less digits than its factorization.

21744453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264.

The product of its digits is 13440, while the sum is 30.

The square root of 21744453 is about 4663.0947877992. The cubic root of 21744453 is about 279.1147765836.

The spelling of 21744453 in words is "twenty-one million, seven hundred forty-four thousand, four hundred fifty-three".