21104048 has 40 divisors (see below), whose sum is σ = 47511840. Its totient is φ = 8893440.

The previous prime is 21104033. The next prime is 21104059. The reversal of 21104048 is 84040112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5288 + ... + 8376.

It is an arithmetic number, because the mean of its divisors is an integer number (1187796).

Almost surely, 2^21104048 is an apocalyptic number.

21104048 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21104048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23755920).

21104048 is an abundant number, since it is smaller than the sum of its proper divisors (26407792).

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

21104048 is a wasteful number, since it uses less digits than its factorization.

21104048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3165 (or 3159 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 21104048 is about 4593.9142351594. The cubic root of 21104048 is about 276.3473188238.

The spelling of 21104048 in words is "twenty-one million, one hundred four thousand, forty-eight".