21200504 has 32 divisors (see below), whose sum is σ = 45066000. Its totient is φ = 9268992.

The previous prime is 21200467. The next prime is 21200507. The reversal of 21200504 is 40500212.

It is a super-2 number, since 2×21200504² = 898922739708032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3389 + ... + 7340.

Almost surely, 2^21200504 is an apocalyptic number.

It is an amenable number.

21200504 is an abundant number, since it is smaller than the sum of its proper divisors (23865496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21200504 is a wasteful number, since it uses less digits than its factorization.

21200504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10767 (or 10763 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 21200504 is about 4604.4005038658. The cubic root of 21200504 is about 276.7676939476.

Adding to 21200504 its reverse (40500212), we get a palindrome (61700716).

The spelling of 21200504 in words is "twenty-one million, two hundred thousand, five hundred four".