21413306 has 8 divisors (see below), whose sum is σ = 32988180. Its totient is φ = 10417248.

The previous prime is 21413303. The next prime is 21413369. The reversal of 21413306 is 60331412.

It can be written as a sum of positive squares in 2 ways, for example, as 19439281 + 1974025 = 4409^2 + 1405^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21413303) 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, 144611 + ... + 144758.

Almost surely, 2^21413306 is an apocalyptic number.

21413306 is a deficient number, since it is larger than the sum of its proper divisors (11574874).

21413306 is a wasteful number, since it uses less digits than its factorization.

21413306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289408.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21413306 is about 4627.4513503656. The cubic root of 21413306 is about 277.6906397731.

Adding to 21413306 its reverse (60331412), we get a palindrome (81744718).

The spelling of 21413306 in words is "twenty-one million, four hundred thirteen thousand, three hundred six".