12105203500221 has 48 divisors (see below), whose sum is σ = 17962622056512. Its totient is φ = 7208251499520.

The previous prime is 12105203500217. The next prime is 12105203500321. The reversal of 12105203500221 is 12200530250121.

12105203500221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12105203500221 - 2² = 12105203500217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12105203500191 and 12105203500200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12105203500211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 651263290 + ... + 651281876.

It is an arithmetic number, because the mean of its divisors is an integer number (374221292844).

Almost surely, 2^{12105203500221} is an apocalyptic number.

It is an amenable number.

12105203500221 is a deficient number, since it is larger than the sum of its proper divisors (5857418556291).

12105203500221 is a wasteful number, since it uses less digits than its factorization.

12105203500221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36042 (or 36011 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 12105203500221 its reverse (12200530250121), we get a palindrome (24305733750342).

The spelling of 12105203500221 in words is "twelve trillion, one hundred five billion, two hundred three million, five hundred thousand, two hundred twenty-one".