21125324832 has 192 divisors, whose sum is σ = 59824106496. Its totient is φ = 6510873600.

The previous prime is 21125324797. The next prime is 21125324863. The reversal of 21125324832 is 23842352112.

It is a junction number, because it is equal to n+sod(n) for n = 21125324793 and 21125324802.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9588243 + ... + 9590445.

It is an arithmetic number, because the mean of its divisors is an integer number (311583888).

Almost surely, 2^21125324832 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21125324832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29912053248).

21125324832 is an abundant number, since it is smaller than the sum of its proper divisors (38698781664).

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

21125324832 is a wasteful number, since it uses less digits than its factorization.

21125324832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2383 (or 2375 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

Adding to 21125324832 its reverse (23842352112), we get a palindrome (44967676944).

The spelling of 21125324832 in words is "twenty-one billion, one hundred twenty-five million, three hundred twenty-four thousand, eight hundred thirty-two".