21636392960 has 576 divisors, whose sum is σ = 67761308160. Its totient is φ = 6564741120.

The previous prime is 21636392927. The next prime is 21636392963. The reversal of 21636392960 is 6929363612.

It is not an unprimeable number, because it can be changed into a prime (21636392963) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 202209227 + ... + 202209333.

It is an arithmetic number, because the mean of its divisors is an integer number (117641160).

Almost surely, 2^21636392960 is an apocalyptic number.

21636392960 is a gapful number since it is divisible by the number (20) 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 21636392960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33880654080).

21636392960 is an abundant number, since it is smaller than the sum of its proper divisors (46124915200).

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

21636392960 is a wasteful number, since it uses less digits than its factorization.

21636392960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 47.

The spelling of 21636392960 in words is "twenty-one billion, six hundred thirty-six million, three hundred ninety-two thousand, nine hundred sixty".