21044845360 has 480 divisors, whose sum is σ = 69250567680. Its totient is φ = 5844787200.

The previous prime is 21044845333. The next prime is 21044845363. The reversal of 21044845360 is 6354844012.

It is not an unprimeable number, because it can be changed into a prime (21044845363) 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 95 ways as a sum of consecutive naturals, for example, 13927005 + ... + 13928515.

It is an arithmetic number, because the mean of its divisors is an integer number (144272016).

Almost surely, 2^21044845360 is an apocalyptic number.

21044845360 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 21044845360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34625283840).

21044845360 is an abundant number, since it is smaller than the sum of its proper divisors (48205722320).

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

21044845360 is a wasteful number, since it uses less digits than its factorization.

21044845360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585 (or 1572 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 37.

The spelling of 21044845360 in words is "twenty-one billion, forty-four million, eight hundred forty-five thousand, three hundred sixty".