21500566230 has 192 divisors, whose sum is σ = 64677299904. Its totient is φ = 4528128000.

The previous prime is 21500566229. The next prime is 21500566259. The reversal of 21500566230 is 3266500512.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 788830 + ... + 815630.

It is an arithmetic number, because the mean of its divisors is an integer number (336860937).

Almost surely, 2^21500566230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21500566230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32338649952).

21500566230 is an abundant number, since it is smaller than the sum of its proper divisors (43176733674).

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

21500566230 is a wasteful number, since it uses less digits than its factorization.

21500566230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26863 (or 26852 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The spelling of 21500566230 in words is "twenty-one billion, five hundred million, five hundred sixty-six thousand, two hundred thirty".