21513540332120 has 16 divisors (see below), whose sum is σ = 48405465747360. Its totient is φ = 8605416132832.

The previous prime is 21513540332107. The next prime is 21513540332161. The reversal of 21513540332120 is 2123304531512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268919254112 + ... + 268919254191.

It is an arithmetic number, because the mean of its divisors is an integer number (3025341609210).

Almost surely, 2^{21513540332120} is an apocalyptic number.

21513540332120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21513540332120 is an abundant number, since it is smaller than the sum of its proper divisors (26891925415240).

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

21513540332120 is a wasteful number, since it uses less digits than its factorization.

21513540332120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537838508314 (or 537838508310 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 21513540332120 its reverse (2123304531512), we get a palindrome (23636844863632).

The spelling of 21513540332120 in words is "twenty-one trillion, five hundred thirteen billion, five hundred forty million, three hundred thirty-two thousand, one hundred twenty".