21744044277240 has 128 divisors (see below), whose sum is σ = 65911593000960. Its totient is φ = 5738027986944.

The previous prime is 21744044277203. The next prime is 21744044277253. The reversal of 21744044277240 is 4277244044712.

It is a self number, because there is not a number n which added to its sum of digits gives 21744044277240.

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, 115922169 + ... + 116109591.

It is an arithmetic number, because the mean of its divisors is an integer number (514934320320).

Almost surely, 2^{21744044277240} is an apocalyptic number.

21744044277240 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 21744044277240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32955796500480).

21744044277240 is an abundant number, since it is smaller than the sum of its proper divisors (44167548723720).

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

21744044277240 is a wasteful number, since it uses less digits than its factorization.

21744044277240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197501 (or 197497 counting only the distinct ones).

The product of its (nonzero) digits is 2809856, while the sum is 48.

The spelling of 21744044277240 in words is "twenty-one trillion, seven hundred forty-four billion, forty-four million, two hundred seventy-seven thousand, two hundred forty".