21504848 has 10 divisors (see below), whose sum is σ = 41665674. Its totient is φ = 10752416.

The previous prime is 21504841. The next prime is 21504871. The reversal of 21504848 is 84840512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14807104 + 6697744 = 3848^2 + 2588^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21504841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672011 + ... + 672042.

Almost surely, 2^21504848 is an apocalyptic number.

It is an amenable number.

21504848 is a deficient number, since it is larger than the sum of its proper divisors (20160826).

21504848 is a wasteful number, since it uses less digits than its factorization.

21504848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344061 (or 1344055 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 21504848 is about 4637.3319915658. The cubic root of 21504848 is about 278.0857868883.

The spelling of 21504848 in words is "twenty-one million, five hundred four thousand, eight hundred forty-eight".