21513503212352 has 112 divisors (see below), whose sum is σ = 44145979637760. Its totient is φ = 10391353228800.

The previous prime is 21513503212319. The next prime is 21513503212363. The reversal of 21513503212352 is 25321230531512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3114735683 + ... + 3114742589.

It is an arithmetic number, because the mean of its divisors is an integer number (394160532480).

Almost surely, 2^{21513503212352} 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 21513503212352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22072989818880).

21513503212352 is an abundant number, since it is smaller than the sum of its proper divisors (22632476425408).

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

21513503212352 is a wasteful number, since it uses less digits than its factorization.

21513503212352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9500 (or 9490 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

Adding to 21513503212352 its reverse (25321230531512), we get a palindrome (46834733743864).

The spelling of 21513503212352 in words is "twenty-one trillion, five hundred thirteen billion, five hundred three million, two hundred twelve thousand, three hundred fifty-two".