21041443 has 8 divisors (see below), whose sum is σ = 21973680. Its totient is φ = 20123040.

The previous prime is 21041441. The next prime is 21041453. The reversal of 21041443 is 34414012.

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 21041443 - 2¹ = 21041441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21041443.

It is not an unprimeable number, because it can be changed into a prime (21041441) 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, 288 + ... + 6493.

It is an arithmetic number, because the mean of its divisors is an integer number (2746710).

Almost surely, 2^21041443 is an apocalyptic number.

21041443 is a deficient number, since it is larger than the sum of its proper divisors (932237).

21041443 is a wasteful number, since it uses less digits than its factorization.

21041443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6917.

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

The square root of 21041443 is about 4587.0952682498. The cubic root of 21041443 is about 276.0737874198.

Adding to 21041443 its reverse (34414012), we get a palindrome (55455455).

The spelling of 21041443 in words is "twenty-one million, forty-one thousand, four hundred forty-three".