21518048 has 12 divisors (see below), whose sum is σ = 42363720. Its totient is φ = 10759008.

The previous prime is 21518047. The next prime is 21518059. The reversal of 21518048 is 84081512.

It is a self number, because there is not a number n which added to its sum of digits gives 21518048.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21518047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336188 + ... + 336251.

It is an arithmetic number, because the mean of its divisors is an integer number (3530310).

Almost surely, 2^21518048 is an apocalyptic number.

It is an amenable number.

21518048 is a deficient number, since it is larger than the sum of its proper divisors (20845672).

21518048 is an equidigital number, since it uses as much as digits as its factorization.

21518048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672449 (or 672441 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 21518048 is about 4638.7550053867. The cubic root of 21518048 is about 278.1426730006.

The spelling of 21518048 in words is "twenty-one million, five hundred eighteen thousand, forty-eight".