21904603823520 has 576 divisors, whose sum is σ = 82584094320000. Its totient is φ = 5242621009920.

The previous prime is 21904603823507. The next prime is 21904603823551. The reversal of 21904603823520 is 2532830640912.

21904603823520 is a `hidden beast` number, since 2 + 1 + 9 + 0 + 4 + 603 + 8 + 2 + 35 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2246851606 + ... + 2246861354.

It is an arithmetic number, because the mean of its divisors is an integer number (143375163750).

Almost surely, 2^{21904603823520} is an apocalyptic number.

21904603823520 is a gapful number since it is divisible by the number (20) 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 21904603823520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41292047160000).

21904603823520 is an abundant number, since it is smaller than the sum of its proper divisors (60679490496480).

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

21904603823520 is a wasteful number, since it uses less digits than its factorization.

21904603823520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11573 (or 11562 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 21904603823520 in words is "twenty-one trillion, nine hundred four billion, six hundred three million, eight hundred twenty-three thousand, five hundred twenty".