21300585520 has 80 divisors (see below), whose sum is σ = 50512561632. Its totient is φ = 8350484480.

The previous prime is 21300585511. The next prime is 21300585613. The reversal of 21300585520 is 2558500312.

It is a tau number, because it is divible by the number of its divisors (80).

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, 5056215 + ... + 5060425.

Almost surely, 2^21300585520 is an apocalyptic number.

21300585520 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 21300585520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25256280816).

21300585520 is an abundant number, since it is smaller than the sum of its proper divisors (29211976112).

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

21300585520 is a wasteful number, since it uses less digits than its factorization.

21300585520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5470 (or 5464 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 21300585520 in words is "twenty-one billion, three hundred million, five hundred eighty-five thousand, five hundred twenty".