21724063530 has 96 divisors (see below), whose sum is σ = 59645787264. Its totient is φ = 5032879104.

The previous prime is 21724063507. The next prime is 21724063541. The reversal of 21724063530 is 3536042712.

It is a junction number, because it is equal to n+sod(n) for n = 21724063491 and 21724063500.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16339 + ... + 209081.

It is an arithmetic number, because the mean of its divisors is an integer number (621310284).

Almost surely, 2^21724063530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21724063530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29822893632).

21724063530 is an abundant number, since it is smaller than the sum of its proper divisors (37921723734).

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

21724063530 is a wasteful number, since it uses less digits than its factorization.

21724063530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192800 (or 192783 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 33.

The spelling of 21724063530 in words is "twenty-one billion, seven hundred twenty-four million, sixty-three thousand, five hundred thirty".