21245032 has 16 divisors (see below), whose sum is σ = 39967200. Its totient is φ = 10587120.

The previous prime is 21245027. The next prime is 21245033. The reversal of 21245032 is 23054212.

It is not an unprimeable number, because it can be changed into a prime (21245033) 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, 1782 + ... + 6757.

It is an arithmetic number, because the mean of its divisors is an integer number (2497950).

Almost surely, 2^21245032 is an apocalyptic number.

It is an amenable number.

21245032 is a deficient number, since it is larger than the sum of its proper divisors (18722168).

21245032 is a wasteful number, since it uses less digits than its factorization.

21245032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8856 (or 8852 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21245032 is about 4609.2333418910. The cubic root of 21245032 is about 276.9613260399.

Adding to 21245032 its reverse (23054212), we get a palindrome (44299244).

The spelling of 21245032 in words is "twenty-one million, two hundred forty-five thousand, thirty-two".