21823066720 has 384 divisors, whose sum is σ = 65719019520. Its totient is φ = 6664273920.

The previous prime is 21823066709. The next prime is 21823066757. The reversal of 21823066720 is 2766032812.

It is a self number, because there is not a number n which added to its sum of digits gives 21823066720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 82977309 + ... + 82977571.

It is an arithmetic number, because the mean of its divisors is an integer number (171143280).

Almost surely, 2^21823066720 is an apocalyptic number.

21823066720 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 21823066720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32859509760).

21823066720 is an abundant number, since it is smaller than the sum of its proper divisors (43895952800).

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

21823066720 is a wasteful number, since it uses less digits than its factorization.

21823066720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 21823066720 in words is "twenty-one billion, eight hundred twenty-three million, sixty-six thousand, seven hundred twenty".