21333230 has 16 divisors (see below), whose sum is σ = 38453184. Its totient is φ = 8521440.

The previous prime is 21333199. The next prime is 21333251. The reversal of 21333230 is 3233312.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21333199 and 21333208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11444 + ... + 13176.

It is an arithmetic number, because the mean of its divisors is an integer number (2403324).

Almost surely, 2^21333230 is an apocalyptic number.

21333230 is a deficient number, since it is larger than the sum of its proper divisors (17119954).

21333230 is a wasteful number, since it uses less digits than its factorization.

21333230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971.

The product of its (nonzero) digits is 324, while the sum is 17.

The square root of 21333230 is about 4618.7909673420. The cubic root of 21333230 is about 277.3440619437.

Adding to 21333230 its reverse (3233312), we get a palindrome (24566542).

The spelling of 21333230 in words is "twenty-one million, three hundred thirty-three thousand, two hundred thirty".