21322432560 has 240 divisors, whose sum is σ = 78083716608. Its totient is φ = 4771353600.

The previous prime is 21322432559. The next prime is 21322432577. The reversal of 21322432560 is 6523422312.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×21322432560² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 422265 + ... + 470055.

Almost surely, 2^21322432560 is an apocalyptic number.

21322432560 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 21322432560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39041858304).

21322432560 is an abundant number, since it is smaller than the sum of its proper divisors (56761284048).

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

21322432560 is a wasteful number, since it uses less digits than its factorization.

21322432560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47844 (or 47825 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 21322432560 its reverse (6523422312), we get a palindrome (27845854872).

The spelling of 21322432560 in words is "twenty-one billion, three hundred twenty-two million, four hundred thirty-two thousand, five hundred sixty".