21796847 has 8 divisors (see below), whose sum is σ = 22796160. Its totient is φ = 20801880.

The previous prime is 21796843. The next prime is 21796867. The reversal of 21796847 is 74869712.

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 21796847 - 2² = 21796843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21796798 and 21796807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21796843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13472 + ... + 15002.

It is an arithmetic number, because the mean of its divisors is an integer number (2849520).

Almost surely, 2^21796847 is an apocalyptic number.

21796847 is a deficient number, since it is larger than the sum of its proper divisors (999313).

21796847 is a wasteful number, since it uses less digits than its factorization.

21796847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2173.

The product of its digits is 169344, while the sum is 44.

The square root of 21796847 is about 4668.7093505593. The cubic root of 21796847 is about 279.3387756218.

The spelling of 21796847 in words is "twenty-one million, seven hundred ninety-six thousand, eight hundred forty-seven".