21165230 has 8 divisors (see below), whose sum is σ = 38097432. Its totient is φ = 8466088.

The previous prime is 21165229. The next prime is 21165241. The reversal of 21165230 is 3256112.

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 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, 1058252 + ... + 1058271.

It is an arithmetic number, because the mean of its divisors is an integer number (4762179).

Almost surely, 2^21165230 is an apocalyptic number.

21165230 is a deficient number, since it is larger than the sum of its proper divisors (16932202).

21165230 is a wasteful number, since it uses less digits than its factorization.

21165230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116530.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 21165230 is about 4600.5684431383. The cubic root of 21165230 is about 276.6141107570.

The spelling of 21165230 in words is "twenty-one million, one hundred sixty-five thousand, two hundred thirty".