21530600588 has 72 divisors (see below), whose sum is σ = 45250928352. Its totient is φ = 8930912256.

The previous prime is 21530600579. The next prime is 21530600617. The reversal of 21530600588 is 88500603512.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1391945 + ... + 1407327.

It is an arithmetic number, because the mean of its divisors is an integer number (628485116).

Almost surely, 2^21530600588 is an apocalyptic number.

21530600588 is a gapful number since it is divisible by the number (28) 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 21530600588, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22625464176).

21530600588 is an abundant number, since it is smaller than the sum of its proper divisors (23720327764).

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

21530600588 is a wasteful number, since it uses less digits than its factorization.

21530600588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15631 (or 15622 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 21530600588 in words is "twenty-one billion, five hundred thirty million, six hundred thousand, five hundred eighty-eight".