21243000240444 has 96 divisors (see below), whose sum is σ = 50921048295936. Its totient is φ = 6888578411520.

The previous prime is 21243000240433. The next prime is 21243000240457. The reversal of 21243000240444 is 44404200034212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 259504329 + ... + 259586175.

It is an arithmetic number, because the mean of its divisors is an integer number (530427586416).

Almost surely, 2^{21243000240444} is an apocalyptic number.

It is an amenable number.

21243000240444 is an abundant number, since it is smaller than the sum of its proper divisors (29678048055492).

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

21243000240444 is a wasteful number, since it uses less digits than its factorization.

21243000240444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83395 (or 83393 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 21243000240444 its reverse (44404200034212), we get a palindrome (65647200274656).

The spelling of 21243000240444 in words is "twenty-one trillion, two hundred forty-three billion, two hundred forty thousand, four hundred forty-four".