21523502130000 has 400 divisors, whose sum is σ = 75155343041856. Its totient is φ = 5274731520000.

The previous prime is 21523502129851. The next prime is 21523502130101. The reversal of 21523502130000 is 3120532512.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (400).

It is a super-3 number, since 3×21523502130000³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 88408440 + ... + 88651560.

Almost surely, 2^{21523502130000} is an apocalyptic number.

21523502130000 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 21523502130000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37577671520928).

21523502130000 is an abundant number, since it is smaller than the sum of its proper divisors (53631840911856).

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

21523502130000 is a wasteful number, since it uses less digits than its factorization.

21523502130000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243392 (or 243371 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 21523502130000 its reverse (3120532512), we get a palindrome (21526622662512).

The spelling of 21523502130000 in words is "twenty-one trillion, five hundred twenty-three billion, five hundred two million, one hundred thirty thousand".