21244306 has 8 divisors (see below), whose sum is σ = 32117760. Its totient is φ = 10538388.

The previous prime is 21244303. The next prime is 21244309. The reversal of 21244306 is 60344212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21244303) and next prime (21244309).

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

It is not an unprimeable number, because it can be changed into a prime (21244303) 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, 41566 + ... + 42073.

It is an arithmetic number, because the mean of its divisors is an integer number (4014720).

Almost surely, 2^21244306 is an apocalyptic number.

21244306 is a deficient number, since it is larger than the sum of its proper divisors (10873454).

21244306 is a wasteful number, since it uses less digits than its factorization.

21244306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83768.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 21244306 is about 4609.1545862555. The cubic root of 21244306 is about 276.9581711657.

Adding to 21244306 its reverse (60344212), we get a palindrome (81588518).

The spelling of 21244306 in words is "twenty-one million, two hundred forty-four thousand, three hundred six".