12100221220221 has 6 divisors (see below), whose sum is σ = 17478097318110. Its totient is φ = 8066814146808.

The previous prime is 12100221220207. The next prime is 12100221220223. The reversal of 12100221220221 is 12202212200121.

It is a happy number.

12100221220221 is a `hidden beast` number, since 1 + 2 + 1 + 0 + 0 + 221 + 220 + 221 = 666.

12100221220221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7378557322500 + 4721663897721 = 2716350^2 + 2172939^2 .

It is not a de Polignac number, because 12100221220221 - 2¹⁰ = 12100221219197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12100221220194 and 12100221220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100221220223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 672234512226 + ... + 672234512243.

It is an arithmetic number, because the mean of its divisors is an integer number (2913016219685).

Almost surely, 2^{12100221220221} is an apocalyptic number.

It is an amenable number.

12100221220221 is a deficient number, since it is larger than the sum of its proper divisors (5377876097889).

12100221220221 is a wasteful number, since it uses less digits than its factorization.

12100221220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344469024475 (or 1344469024472 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12100221220221 its reverse (12202212200121), we get a palindrome (24302433420342).

The spelling of 12100221220221 in words is "twelve trillion, one hundred billion, two hundred twenty-one million, two hundred twenty thousand, two hundred twenty-one".