21905230 has 8 divisors (see below), whose sum is σ = 39429432. Its totient is φ = 8762088.

The previous prime is 21905227. The next prime is 21905239. The reversal of 21905230 is 3250912.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21905239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1095252 + ... + 1095271.

It is an arithmetic number, because the mean of its divisors is an integer number (4928679).

Almost surely, 2^21905230 is an apocalyptic number.

21905230 is a deficient number, since it is larger than the sum of its proper divisors (17524202).

21905230 is a wasteful number, since it uses less digits than its factorization.

21905230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190530.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 21905230 is about 4680.3023406613. The cubic root of 21905230 is about 279.8010065699.

The spelling of 21905230 in words is "twenty-one million, nine hundred five thousand, two hundred thirty".