21894715 has 8 divisors (see below), whose sum is σ = 26832960. Its totient is φ = 17142912.

The previous prime is 21894703. The next prime is 21894737. The reversal of 21894715 is 51749812.

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 21894715 - 2⁵ = 21894683 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46350 + ... + 46819.

It is an arithmetic number, because the mean of its divisors is an integer number (3354120).

Almost surely, 2^21894715 is an apocalyptic number.

21894715 is a deficient number, since it is larger than the sum of its proper divisors (4938245).

21894715 is an equidigital number, since it uses as much as digits as its factorization.

21894715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93221.

The product of its digits is 20160, while the sum is 37.

The square root of 21894715 is about 4679.1788809576. The cubic root of 21894715 is about 279.7562291588.

The spelling of 21894715 in words is "twenty-one million, eight hundred ninety-four thousand, seven hundred fifteen".