21230284 has 12 divisors (see below), whose sum is σ = 37211608. Its totient is φ = 10598400.

The previous prime is 21230273. The next prime is 21230299. The reversal of 21230284 is 48203212.

It is an unprimeable number.

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, 1077 + ... + 6604.

Almost surely, 2^21230284 is an apocalyptic number.

It is an amenable number.

21230284 is a deficient number, since it is larger than the sum of its proper divisors (15981324).

21230284 is a wasteful number, since it uses less digits than its factorization.

21230284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8376 (or 8374 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21230284 is about 4607.6332319316. The cubic root of 21230284 is about 276.8972236627.

Adding to 21230284 its reverse (48203212), we get a palindrome (69433496).

The spelling of 21230284 in words is "twenty-one million, two hundred thirty thousand, two hundred eighty-four".