21403353244000 has 768 divisors, whose sum is σ = 68250387179520. Its totient is φ = 6405980774400.

The previous prime is 21403353243997. The next prime is 21403353244001. The reversal of 21403353244000 is 44235330412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403353244001) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4446985594 + ... + 4446990406.

It is an arithmetic number, because the mean of its divisors is an integer number (88867691640).

Almost surely, 2^{21403353244000} is an apocalyptic number.

21403353244000 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 21403353244000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34125193589760).

21403353244000 is an abundant number, since it is smaller than the sum of its proper divisors (46847033935520).

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

21403353244000 is a wasteful number, since it uses less digits than its factorization.

21403353244000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5520 (or 5502 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 31.

Adding to 21403353244000 its reverse (44235330412), we get a palindrome (21447588574412).

The spelling of 21403353244000 in words is "twenty-one trillion, four hundred three billion, three hundred fifty-three million, two hundred forty-four thousand".