21044320013040 has 160 divisors (see below), whose sum is σ = 68672978457600. Its totient is φ = 5316301900800.

The previous prime is 21044320012993. The next prime is 21044320013081. The reversal of 21044320013040 is 4031002344012.

It is a super-2 number, since 2×21044320013040² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21044320013040.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 271322265 + ... + 271399815.

It is an arithmetic number, because the mean of its divisors is an integer number (429206115360).

Almost surely, 2^{21044320013040} is an apocalyptic number.

21044320013040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21044320013040 is an abundant number, since it is smaller than the sum of its proper divisors (47628658444560).

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

21044320013040 is a wasteful number, since it uses less digits than its factorization.

21044320013040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137095 (or 137089 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21044320013040 its reverse (4031002344012), we get a palindrome (25075322357052).

The spelling of 21044320013040 in words is "twenty-one trillion, forty-four billion, three hundred twenty million, thirteen thousand, forty".