21204241443424 has 96 divisors (see below), whose sum is σ = 45091757519424. Its totient is φ = 9757269780480.

The previous prime is 21204241443379. The next prime is 21204241443433. The reversal of 21204241443424 is 42434414240212.

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 15 ways as a sum of consecutive naturals, for example, 537327054 + ... + 537366514.

It is an arithmetic number, because the mean of its divisors is an integer number (469705807494).

Almost surely, 2^{21204241443424} 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 21204241443424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22545878759712).

21204241443424 is an abundant number, since it is smaller than the sum of its proper divisors (23887516076000).

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

21204241443424 is a wasteful number, since it uses less digits than its factorization.

21204241443424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43320 (or 43312 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 37.

Adding to 21204241443424 its reverse (42434414240212), we get a palindrome (63638655683636).

The spelling of 21204241443424 in words is "twenty-one trillion, two hundred four billion, two hundred forty-one million, four hundred forty-three thousand, four hundred twenty-four".