21855448 has 16 divisors (see below), whose sum is σ = 41102280. Its totient is φ = 10894848.

The previous prime is 21855439. The next prime is 21855487. The reversal of 21855448 is 84455812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1161 + ... + 6712.

Almost surely, 2^21855448 is an apocalyptic number.

It is an amenable number.

21855448 is a deficient number, since it is larger than the sum of its proper divisors (19246832).

21855448 is a wasteful number, since it uses less digits than its factorization.

21855448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8226 (or 8222 counting only the distinct ones).

The product of its digits is 51200, while the sum is 37.

The square root of 21855448 is about 4674.9810694804. The cubic root of 21855448 is about 279.5888864687.

The spelling of 21855448 in words is "twenty-one million, eight hundred fifty-five thousand, four hundred forty-eight".