21530422230 has 64 divisors (see below), whose sum is σ = 53239845888. Its totient is φ = 5569518080.

The previous prime is 21530422217. The next prime is 21530422253. The reversal of 21530422230 is 3222403512.

It is a self number, because there is not a number n which added to its sum of digits gives 21530422230.

It is a congruent number.

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, 91765 + ... + 226895.

It is an arithmetic number, because the mean of its divisors is an integer number (831872592).

Almost surely, 2^21530422230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21530422230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26619922944).

21530422230 is an abundant number, since it is smaller than the sum of its proper divisors (31709423658).

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

21530422230 is a wasteful number, since it uses less digits than its factorization.

21530422230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135301.

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 21530422230 its reverse (3222403512), we get a palindrome (24752825742).

The spelling of 21530422230 in words is "twenty-one billion, five hundred thirty million, four hundred twenty-two thousand, two hundred thirty".