21035824 has 20 divisors (see below), whose sum is σ = 40934880. Its totient is φ = 10472000.

The previous prime is 21035797. The next prime is 21035867. The reversal of 21035824 is 42853012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1074 + ... + 6574.

It is an arithmetic number, because the mean of its divisors is an integer number (2046744).

Almost surely, 2^21035824 is an apocalyptic number.

It is an amenable number.

21035824 is a deficient number, since it is larger than the sum of its proper divisors (19899056).

21035824 is a wasteful number, since it uses less digits than its factorization.

21035824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5748 (or 5742 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 21035824 is about 4586.4827482506. The cubic root of 21035824 is about 276.0492105769.

Adding to 21035824 its reverse (42853012), we get a palindrome (63888836).

The spelling of 21035824 in words is "twenty-one million, thirty-five thousand, eight hundred twenty-four".