21675448 has 32 divisors (see below), whose sum is σ = 42577920. Its totient is φ = 10332000.

The previous prime is 21675427. The next prime is 21675449. The reversal of 21675448 is 84457612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21675449) 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, 16993 + ... + 18223.

It is an arithmetic number, because the mean of its divisors is an integer number (1330560).

Almost surely, 2^21675448 is an apocalyptic number.

It is an amenable number.

21675448 is a deficient number, since it is larger than the sum of its proper divisors (20902472).

21675448 is a wasteful number, since it uses less digits than its factorization.

21675448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339 (or 1335 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 21675448 is about 4655.6898522131. The cubic root of 21675448 is about 278.8192111651.

The spelling of 21675448 in words is "twenty-one million, six hundred seventy-five thousand, four hundred forty-eight".