21795788320 has 96 divisors (see below), whose sum is σ = 53179032816. Its totient is φ = 8435404800.

The previous prime is 21795788309. The next prime is 21795788327. The reversal of 21795788320 is 2388759712.

It can be written as a sum of positive squares in 8 ways, for example, as 8324007696 + 13471780624 = 91236^2 + 116068^2 .

It is not an unprimeable number, because it can be changed into a prime (21795788327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1061350 + ... + 1081690.

Almost surely, 2^21795788320 is an apocalyptic number.

21795788320 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 21795788320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26589516408).

21795788320 is an abundant number, since it is smaller than the sum of its proper divisors (31383244496).

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

21795788320 is a wasteful number, since it uses less digits than its factorization.

21795788320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20574 (or 20566 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 21795788320 in words is "twenty-one billion, seven hundred ninety-five million, seven hundred eighty-eight thousand, three hundred twenty".