12201221012121 has 16 divisors (see below), whose sum is σ = 18076802211520. Its totient is φ = 8133733687680.

The previous prime is 12201221012089. The next prime is 12201221012143. The reversal of 12201221012121 is 12121012210221.

12201221012121 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 12201221012121 - 2⁵ = 12201221012089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12201221012094 and 12201221012103.

It is not an unprimeable number, because it can be changed into a prime (12201221012021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10949155 + ... + 12011928.

It is an arithmetic number, because the mean of its divisors is an integer number (1129800138220).

Almost surely, 2^{12201221012121} is an apocalyptic number.

It is an amenable number.

12201221012121 is a deficient number, since it is larger than the sum of its proper divisors (5875581199399).

12201221012121 is a wasteful number, since it uses less digits than its factorization.

12201221012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22980773 (or 22980767 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12201221012121 its reverse (12121012210221), we get a palindrome (24322233222342).

The spelling of 12201221012121 in words is "twelve trillion, two hundred one billion, two hundred twenty-one million, twelve thousand, one hundred twenty-one".