21648548 has 24 divisors (see below), whose sum is σ = 40310424. Its totient is φ = 10137600.

The previous prime is 21648541. The next prime is 21648551. The reversal of 21648548 is 84584612.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13853284 + 7795264 = 3722^2 + 2792^2 .

It is not an unprimeable number, because it can be changed into a prime (21648541) 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, 15728 + ... + 17048.

It is an arithmetic number, because the mean of its divisors is an integer number (1679601).

Almost surely, 2^21648548 is an apocalyptic number.

It is an amenable number.

21648548 is a deficient number, since it is larger than the sum of its proper divisors (18661876).

21648548 is a wasteful number, since it uses less digits than its factorization.

21648548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583 (or 1581 counting only the distinct ones).

The product of its digits is 61440, while the sum is 38.

The square root of 21648548 is about 4652.8000171939. The cubic root of 21648548 is about 278.7038219067.

The spelling of 21648548 in words is "twenty-one million, six hundred forty-eight thousand, five hundred forty-eight".