21200232 has 16 divisors (see below), whose sum is σ = 53000640. Its totient is φ = 7066736.

The previous prime is 21200209. The next prime is 21200233. The reversal of 21200232 is 23200212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (21200233) 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, 441648 + ... + 441695.

It is an arithmetic number, because the mean of its divisors is an integer number (3312540).

Almost surely, 2^21200232 is an apocalyptic number.

It is an amenable number.

21200232 is an abundant number, since it is smaller than the sum of its proper divisors (31800408).

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

21200232 is a wasteful number, since it uses less digits than its factorization.

21200232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883352 (or 883348 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21200232 is about 4604.3709668097. The cubic root of 21200232 is about 276.7665103101.

Adding to 21200232 its reverse (23200212), we get a palindrome (44400444).

The spelling of 21200232 in words is "twenty-one million, two hundred thousand, two hundred thirty-two".