21744354 has 8 divisors (see below), whose sum is σ = 43488720. Its totient is φ = 7248116.

The previous prime is 21744347. The next prime is 21744397. The reversal of 21744354 is 45344712.

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

21744354 is an admirable number.

It is an unprimeable number.

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, 1812024 + ... + 1812035.

It is an arithmetic number, because the mean of its divisors is an integer number (5436090).

Almost surely, 2^21744354 is an apocalyptic number.

21744354 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21744354 is a wasteful number, since it uses less digits than its factorization.

21744354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3624064.

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

The square root of 21744354 is about 4663.0841725193. The cubic root of 21744354 is about 279.1143529904.

The spelling of 21744354 in words is "twenty-one million, seven hundred forty-four thousand, three hundred fifty-four".