21866792368920 has 128 divisors (see below), whose sum is σ = 66349904025600. Its totient is φ = 5764544603136.

The previous prime is 21866792368843. The next prime is 21866792368933. The reversal of 21866792368920 is 2986329766812.

It is a happy number.

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, 57557427 + ... + 57936093.

It is an arithmetic number, because the mean of its divisors is an integer number (518358625200).

Almost surely, 2^{21866792368920} is an apocalyptic number.

21866792368920 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 21866792368920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33174952012800).

21866792368920 is an abundant number, since it is smaller than the sum of its proper divisors (44483111656680).

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

21866792368920 is a wasteful number, since it uses less digits than its factorization.

21866792368920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384177 (or 384173 counting only the distinct ones).

The product of its (nonzero) digits is 188116992, while the sum is 69.

The spelling of 21866792368920 in words is "twenty-one trillion, eight hundred sixty-six billion, seven hundred ninety-two million, three hundred sixty-eight thousand, nine hundred twenty".