21244104424400 has 480 divisors, whose sum is σ = 61643313325440. Its totient is φ = 6932164608000.

The previous prime is 21244104424397. The next prime is 21244104424409. The reversal of 21244104424400 is 442440144212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21244104424409) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 663675596 + ... + 663707604.

It is an arithmetic number, because the mean of its divisors is an integer number (128423569428).

Almost surely, 2^{21244104424400} is an apocalyptic number.

21244104424400 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 21244104424400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30821656662720).

21244104424400 is an abundant number, since it is smaller than the sum of its proper divisors (40399208901040).

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

21244104424400 is a wasteful number, since it uses less digits than its factorization.

21244104424400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32375 (or 32364 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 32.

Adding to 21244104424400 its reverse (442440144212), we get a palindrome (21686544568612).

The spelling of 21244104424400 in words is "twenty-one trillion, two hundred forty-four billion, one hundred four million, four hundred twenty-four thousand, four hundred".