21200524 has 12 divisors (see below), whose sum is σ = 37548504. Its totient is φ = 10472384.

The previous prime is 21200521. The next prime is 21200533. The reversal of 21200524 is 42500212.

It is a junction number, because it is equal to n+sod(n) for n = 21200498 and 21200507.

It is not an unprimeable number, because it can be changed into a prime (21200521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31597 + ... + 32260.

It is an arithmetic number, because the mean of its divisors is an integer number (3129042).

Almost surely, 2^21200524 is an apocalyptic number.

It is an amenable number.

21200524 is a deficient number, since it is larger than the sum of its proper divisors (16347980).

21200524 is a wasteful number, since it uses less digits than its factorization.

21200524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63944 (or 63942 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 21200524 is about 4604.4026757007. The cubic root of 21200524 is about 276.7677809793.

Adding to 21200524 its reverse (42500212), we get a palindrome (63700736).

The spelling of 21200524 in words is "twenty-one million, two hundred thousand, five hundred twenty-four".