21335230 has 16 divisors (see below), whose sum is σ = 43889760. Its totient is φ = 7314912.

The previous prime is 21335219. The next prime is 21335231. The reversal of 21335230 is 3253312.

It is a junction number, because it is equal to n+sod(n) for n = 21335198 and 21335207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21335231) 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 7 ways as a sum of consecutive naturals, for example, 152325 + ... + 152464.

It is an arithmetic number, because the mean of its divisors is an integer number (2743110).

Almost surely, 2^21335230 is an apocalyptic number.

21335230 is an abundant number, since it is smaller than the sum of its proper divisors (22554530).

21335230 is a wasteful number, since it uses less digits than its factorization.

21335230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304803.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 21335230 is about 4619.0074691431. The cubic root of 21335230 is about 277.3527287168.

Adding to 21335230 its reverse (3253312), we get a palindrome (24588542).

The spelling of 21335230 in words is "twenty-one million, three hundred thirty-five thousand, two hundred thirty".