21043324 has 12 divisors (see below), whose sum is σ = 36861664. Its totient is φ = 10511424.

The previous prime is 21043313. The next prime is 21043339. The reversal of 21043324 is 42334012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3844 + ... + 7540.

Almost surely, 2^21043324 is an apocalyptic number.

It is an amenable number.

21043324 is a deficient number, since it is larger than the sum of its proper divisors (15818340).

21043324 is a wasteful number, since it uses less digits than its factorization.

21043324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5124 (or 5122 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 21043324 is about 4587.3002953807. The cubic root of 21043324 is about 276.0820137144.

Adding to 21043324 its reverse (42334012), we get a palindrome (63377336).

It can be divided in two parts, 210 and 43324, that added together give a palindrome (43534).

The spelling of 21043324 in words is "twenty-one million, forty-three thousand, three hundred twenty-four".