21302230 has 32 divisors (see below), whose sum is σ = 40642560. Its totient is φ = 8016480.

The previous prime is 21302227. The next prime is 21302251. The reversal of 21302230 is 3220312.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21302230.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35997 + ... + 36583.

It is an arithmetic number, because the mean of its divisors is an integer number (1270080).

Almost surely, 2^21302230 is an apocalyptic number.

21302230 is a deficient number, since it is larger than the sum of its proper divisors (19340330).

21302230 is a wasteful number, since it uses less digits than its factorization.

21302230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21302230 is about 4615.4338907626. The cubic root of 21302230 is about 277.2096576396.

Adding to 21302230 its reverse (3220312), we get a palindrome (24522542).

The spelling of 21302230 in words is "twenty-one million, three hundred two thousand, two hundred thirty".