21717448 has 16 divisors (see below), whose sum is σ = 41212080. Its totient is φ = 10727568.

The previous prime is 21717407. The next prime is 21717461. The reversal of 21717448 is 84471712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15690 + ... + 17017.

It is an arithmetic number, because the mean of its divisors is an integer number (2575755).

Almost surely, 2^21717448 is an apocalyptic number.

It is an amenable number.

21717448 is a deficient number, since it is larger than the sum of its proper divisors (19494632).

21717448 is a wasteful number, since it uses less digits than its factorization.

21717448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32796 (or 32792 counting only the distinct ones).

The product of its digits is 12544, while the sum is 34.

The square root of 21717448 is about 4660.1982790435. The cubic root of 21717448 is about 278.9991820910. Note that the first 3 decimals are identical.

The spelling of 21717448 in words is "twenty-one million, seven hundred seventeen thousand, four hundred forty-eight".