21968315 has 8 divisors (see below), whose sum is σ = 26658720. Its totient is φ = 17376832.

The previous prime is 21968293. The next prime is 21968321. The reversal of 21968315 is 51386912.

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 21968315 - 2¹² = 21964219 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, 24239 + ... + 25128.

It is an arithmetic number, because the mean of its divisors is an integer number (3332340).

Almost surely, 2^21968315 is an apocalyptic number.

21968315 is a deficient number, since it is larger than the sum of its proper divisors (4690405).

21968315 is an equidigital number, since it uses as much as digits as its factorization.

21968315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49461.

The product of its digits is 12960, while the sum is 35.

The square root of 21968315 is about 4687.0369104585. The cubic root of 21968315 is about 280.0693493190.

The spelling of 21968315 in words is "twenty-one million, nine hundred sixty-eight thousand, three hundred fifteen".