21416315 has 8 divisors (see below), whose sum is σ = 25814160. Its totient is φ = 17056672.

The previous prime is 21416281. The next prime is 21416321. The reversal of 21416315 is 51361412.

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

It is a cyclic number.

It is not a de Polignac number, because 21416315 - 2¹² = 21412219 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8300 + ... + 10569.

It is an arithmetic number, because the mean of its divisors is an integer number (3226770).

Almost surely, 2^21416315 is an apocalyptic number.

21416315 is a deficient number, since it is larger than the sum of its proper divisors (4397845).

21416315 is a wasteful number, since it uses less digits than its factorization.

21416315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19101.

The product of its digits is 720, while the sum is 23.

The square root of 21416315 is about 4627.7764639187. The cubic root of 21416315 is about 277.7036462032.

Adding to 21416315 its reverse (51361412), we get a palindrome (72777727).

The spelling of 21416315 in words is "twenty-one million, four hundred sixteen thousand, three hundred fifteen".