21043282 has 8 divisors (see below), whose sum is σ = 33993036. Its totient is φ = 9712272.

The previous prime is 21043273. The next prime is 21043289. The reversal of 21043282 is 28234012.

It can be written as a sum of positive squares in 2 ways, for example, as 20511841 + 531441 = 4529^2 + 729^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21043289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404653 + ... + 404704.

Almost surely, 2^21043282 is an apocalyptic number.

21043282 is a deficient number, since it is larger than the sum of its proper divisors (12949754).

21043282 is a wasteful number, since it uses less digits than its factorization.

21043282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809372.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21043282 is about 4587.2957175225. The cubic root of 21043282 is about 276.0818300385.

Adding to 21043282 its reverse (28234012), we get a palindrome (49277294).

The spelling of 21043282 in words is "twenty-one million, forty-three thousand, two hundred eighty-two".