21443453513200 has 120 divisors (see below), whose sum is σ = 52062184302480. Its totient is φ = 8486954956800.

The previous prime is 21443453513113. The next prime is 21443453513203. The reversal of 21443453513200 is 231535434412.

It is a self number, because there is not a number n which added to its sum of digits gives 21443453513200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443453513203) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 35179020 + ... + 35783380.

It is an arithmetic number, because the mean of its divisors is an integer number (433851535854).

Almost surely, 2^{21443453513200} is an apocalyptic number.

21443453513200 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 21443453513200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26031092151240).

21443453513200 is an abundant number, since it is smaller than the sum of its proper divisors (30618730789280).

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

21443453513200 is a wasteful number, since it uses less digits than its factorization.

21443453513200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605315 (or 605304 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 37.

Adding to 21443453513200 its reverse (231535434412), we get a palindrome (21674988947612).

The spelling of 21443453513200 in words is "twenty-one trillion, four hundred forty-three billion, four hundred fifty-three million, five hundred thirteen thousand, two hundred".