21796778592 has 120 divisors (see below), whose sum is σ = 64220725800. Its totient is φ = 7252333056.

The previous prime is 21796778557. The next prime is 21796778593. The reversal of 21796778592 is 29587769712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21796778593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1467459 + ... + 1482237.

It is an arithmetic number, because the mean of its divisors is an integer number (535172715).

Almost surely, 2^21796778592 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 21796778592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32110362900).

21796778592 is an abundant number, since it is smaller than the sum of its proper divisors (42423947208).

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

21796778592 is a wasteful number, since it uses less digits than its factorization.

21796778592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15370 (or 15353 counting only the distinct ones).

The product of its digits is 26671680, while the sum is 63.

The spelling of 21796778592 in words is "twenty-one billion, seven hundred ninety-six million, seven hundred seventy-eight thousand, five hundred ninety-two".