21210230 has 8 divisors (see below), whose sum is σ = 38178432. Its totient is φ = 8484088.

The previous prime is 21210227. The next prime is 21210269. The reversal of 21210230 is 3201212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060502 + ... + 1060521.

It is an arithmetic number, because the mean of its divisors is an integer number (4772304).

Almost surely, 2^21210230 is an apocalyptic number.

21210230 is a deficient number, since it is larger than the sum of its proper divisors (16968202).

21210230 is a wasteful number, since it uses less digits than its factorization.

21210230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121030.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21210230 is about 4605.4565463155. The cubic root of 21210230 is about 276.8100110399.

Adding to 21210230 its reverse (3201212), we get a palindrome (24411442).

The spelling of 21210230 in words is "twenty-one million, two hundred ten thousand, two hundred thirty".