21573848 has 8 divisors (see below), whose sum is σ = 40450980. Its totient is φ = 10786920.

The previous prime is 21573829. The next prime is 21573857. The reversal of 21573848 is 84837512.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1348358 + ... + 1348373.

Almost surely, 2^21573848 is an apocalyptic number.

It is an amenable number.

21573848 is a deficient number, since it is larger than the sum of its proper divisors (18877132).

21573848 is a wasteful number, since it uses less digits than its factorization.

21573848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2696737 (or 2696733 counting only the distinct ones).

The product of its digits is 53760, while the sum is 38.

The square root of 21573848 is about 4644.7656560907. The cubic root of 21573848 is about 278.3828894117.

The spelling of 21573848 in words is "twenty-one million, five hundred seventy-three thousand, eight hundred forty-eight".