21523150555100 has 36 divisors (see below), whose sum is σ = 46708026552264. Its totient is φ = 8608745964480.

The previous prime is 21523150555097. The next prime is 21523150555117. The reversal of 21523150555100 is 155505132512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4743539 + ... + 8096138.

Almost surely, 2^{21523150555100} is an apocalyptic number.

21523150555100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21523150555100 is an abundant number, since it is smaller than the sum of its proper divisors (25184875997164).

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

21523150555100 is a wasteful number, since it uses less digits than its factorization.

21523150555100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12856454 (or 12856447 counting only the distinct ones).

The product of its (nonzero) digits is 37500, while the sum is 35.

Adding to 21523150555100 its reverse (155505132512), we get a palindrome (21678655687612).

The spelling of 21523150555100 in words is "twenty-one trillion, five hundred twenty-three billion, one hundred fifty million, five hundred fifty-five thousand, one hundred".