21832345 has 4 divisors (see below), whose sum is σ = 26198820. Its totient is φ = 17465872.

The previous prime is 21832337. The next prime is 21832351. The reversal of 21832345 is 54323812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7551504 + 14280841 = 2748^2 + 3779^2 .

It is a cyclic number.

It is not a de Polignac number, because 21832345 - 2³ = 21832337 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2183230 + ... + 2183239.

It is an arithmetic number, because the mean of its divisors is an integer number (6549705).

Almost surely, 2^21832345 is an apocalyptic number.

It is an amenable number.

21832345 is a deficient number, since it is larger than the sum of its proper divisors (4366475).

21832345 is an equidigital number, since it uses as much as digits as its factorization.

21832345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4366474.

The product of its digits is 5760, while the sum is 28.

The square root of 21832345 is about 4672.5094970476. The cubic root of 21832345 is about 279.4903356116.

The spelling of 21832345 in words is "twenty-one million, eight hundred thirty-two thousand, three hundred forty-five".