21601580796 has 96 divisors (see below), whose sum is σ = 57702550080. Its totient is φ = 6983407872.

The previous prime is 21601580789. The next prime is 21601580801. The reversal of 21601580796 is 69708510612.

21601580796 is a `hidden beast` number, since 2 + 1 + 60 + 1 + 580 + 7 + 9 + 6 = 666.

It is a super-2 number, since 2×21601580796² (a number of 21 digits) contains 22 as substring.

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, 1258206 + ... + 1275258.

It is an arithmetic number, because the mean of its divisors is an integer number (601068230).

Almost surely, 2^21601580796 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21601580796, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28851275040).

21601580796 is an abundant number, since it is smaller than the sum of its proper divisors (36100969284).

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

21601580796 is a wasteful number, since it uses less digits than its factorization.

21601580796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17420 (or 17412 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 21601580796 in words is "twenty-one billion, six hundred one million, five hundred eighty thousand, seven hundred ninety-six".