21793581488 has 80 divisors (see below), whose sum is σ = 49538496000. Its totient is φ = 9093081600.

The previous prime is 21793581487. The next prime is 21793581521. The reversal of 21793581488 is 88418539712.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is not an unprimeable number, because it can be changed into a prime (21793581487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2286653 + ... + 2296163.

It is an arithmetic number, because the mean of its divisors is an integer number (619231200).

Almost surely, 2^21793581488 is an apocalyptic number.

21793581488 is a gapful number since it is divisible by the number (28) 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 21793581488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24769248000).

21793581488 is an abundant number, since it is smaller than the sum of its proper divisors (27744914512).

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

21793581488 is a wasteful number, since it uses less digits than its factorization.

21793581488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10066 (or 10060 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 56.

The spelling of 21793581488 in words is "twenty-one billion, seven hundred ninety-three million, five hundred eighty-one thousand, four hundred eighty-eight".