21230204 has 18 divisors (see below), whose sum is σ = 38484264. Its totient is φ = 10247440.

The previous prime is 21230203. The next prime is 21230213. The reversal of 21230204 is 40203212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 209 + ... + 6519.

Almost surely, 2^21230204 is an apocalyptic number.

It is an amenable number.

21230204 is a deficient number, since it is larger than the sum of its proper divisors (17254060).

21230204 is a wasteful number, since it uses less digits than its factorization.

21230204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6373 (or 6342 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 21230204 is about 4607.6245506768. The cubic root of 21230204 is about 276.8968758607.

Adding to 21230204 its reverse (40203212), we get a palindrome (61433416).

The spelling of 21230204 in words is "twenty-one million, two hundred thirty thousand, two hundred four".