21552350421105 has 72 divisors (see below), whose sum is σ = 43523745100992. Its totient is φ = 9837274418496.

The previous prime is 21552350421083. The next prime is 21552350421169. The reversal of 21552350421105 is 50112405325512.

21552350421105 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 23 + 504 + 21 + 105 = 666.

It is not a de Polignac number, because 21552350421105 - 2²⁰ = 21552349372529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21552350421105.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6126927 + ... + 8980196.

It is an arithmetic number, because the mean of its divisors is an integer number (604496459736).

Almost surely, 2^{21552350421105} is an apocalyptic number.

It is an amenable number.

21552350421105 is an abundant number, since it is smaller than the sum of its proper divisors (21971394679887).

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

21552350421105 is a wasteful number, since it uses less digits than its factorization.

21552350421105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15107795 (or 15107785 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

Adding to 21552350421105 its reverse (50112405325512), we get a palindrome (71664755746617).

The spelling of 21552350421105 in words is "twenty-one trillion, five hundred fifty-two billion, three hundred fifty million, four hundred twenty-one thousand, one hundred five".