21048120 has 64 divisors (see below), whose sum is σ = 70164000. Its totient is φ = 5612544.

The previous prime is 21048119. The next prime is 21048133. The reversal of 21048120 is 2184012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21048093 and 21048102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8665 + ... + 10824.

Almost surely, 2^21048120 is an apocalyptic number.

21048120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21048120 is an abundant number, since it is smaller than the sum of its proper divisors (49115880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21048120 is a wasteful number, since it uses less digits than its factorization.

21048120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19509 (or 19499 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 21048120 is about 4587.8230131512. The cubic root of 21048120 is about 276.1029861418.

The spelling of 21048120 in words is "twenty-one million, forty-eight thousand, one hundred twenty".