21395648 has 28 divisors (see below), whose sum is σ = 42714672. Its totient is φ = 10632960.

The previous prime is 21395617. The next prime is 21395659. The reversal of 21395648 is 84659312.

It is a happy 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, 10661 + ... + 12507.

It is an arithmetic number, because the mean of its divisors is an integer number (1525524).

Almost surely, 2^21395648 is an apocalyptic number.

It is an amenable number.

21395648 is a deficient number, since it is larger than the sum of its proper divisors (21319024).

21395648 is a wasteful number, since it uses less digits than its factorization.

21395648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040 (or 2030 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 21395648 is about 4625.5429951520. The cubic root of 21395648 is about 277.6142883404.

The spelling of 21395648 in words is "twenty-one million, three hundred ninety-five thousand, six hundred forty-eight".