21325336560 has 400 divisors, whose sum is σ = 82781389152. Its totient is φ = 5042995200.

The previous prime is 21325336517. The next prime is 21325336619. The reversal of 21325336560 is 6563352312.

21325336560 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 533 + 65 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2918832 + ... + 2926128.

Almost surely, 2^21325336560 is an apocalyptic number.

21325336560 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 21325336560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41390694576).

21325336560 is an abundant number, since it is smaller than the sum of its proper divisors (61456052592).

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

21325336560 is a wasteful number, since it uses less digits than its factorization.

21325336560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7374 (or 7359 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 36.

Adding to 21325336560 its reverse (6563352312), we get a palindrome (27888688872).

The spelling of 21325336560 in words is "twenty-one billion, three hundred twenty-five million, three hundred thirty-six thousand, five hundred sixty".