21200230 has 16 divisors (see below), whose sum is σ = 38252160. Its totient is φ = 8459712.

The previous prime is 21200209. The next prime is 21200233. The reversal of 21200230 is 3200212.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200233) 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, 2251 + ... + 6889.

It is an arithmetic number, because the mean of its divisors is an integer number (2390760).

Almost surely, 2^21200230 is an apocalyptic number.

21200230 is a deficient number, since it is larger than the sum of its proper divisors (17051930).

21200230 is a wasteful number, since it uses less digits than its factorization.

21200230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5103.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 21200230 is about 4604.3707496248. The cubic root of 21200230 is about 276.7665016068.

Adding to 21200230 its reverse (3200212), we get a palindrome (24400442).

The spelling of 21200230 in words is "twenty-one million, two hundred thousand, two hundred thirty".