21443041 has 8 divisors (see below), whose sum is σ = 22675968. Its totient is φ = 20244000.

The previous prime is 21443033. The next prime is 21443047. The reversal of 21443041 is 14034412.

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 21443041 - 2³ = 21443033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21443047) 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, 7165 + ... + 9706.

It is an arithmetic number, because the mean of its divisors is an integer number (2834496).

Almost surely, 2^21443041 is an apocalyptic number.

It is an amenable number.

21443041 is a deficient number, since it is larger than the sum of its proper divisors (1232927).

21443041 is a wasteful number, since it uses less digits than its factorization.

21443041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16943.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21443041 is about 4630.6631274581. The cubic root of 21443041 is about 277.8191161530.

Adding to 21443041 its reverse (14034412), we get a palindrome (35477453).

The spelling of 21443041 in words is "twenty-one million, four hundred forty-three thousand, forty-one".