12121201121211 has 96 divisors (see below), whose sum is σ = 22845113561088. Its totient is φ = 6020129122560.

The previous prime is 12121201121207. The next prime is 12121201121213. The reversal of 12121201121211 is 11212110212121.

It is a happy number.

12121201121211 is a `hidden beast` number, since 1 + 212 + 120 + 1 + 121 + 211 = 666.

It is not a de Polignac number, because 12121201121211 - 2² = 12121201121207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12121201121213) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5512221 + ... + 7391006.

It is an arithmetic number, because the mean of its divisors is an integer number (237969932928).

Almost surely, 2^{12121201121211} is an apocalyptic number.

12121201121211 is a deficient number, since it is larger than the sum of its proper divisors (10723912439877).

12121201121211 is a wasteful number, since it uses less digits than its factorization.

12121201121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12903321 (or 12903318 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12121201121211 its reverse (11212110212121), we get a palindrome (23333311333332).

The spelling of 12121201121211 in words is "twelve trillion, one hundred twenty-one billion, two hundred one million, one hundred twenty-one thousand, two hundred eleven".