12210211210121 has 2 divisors, whose sum is σ = 12210211210122. Its totient is φ = 12210211210120.

The previous prime is 12210211210117. The next prime is 12210211210151. The reversal of 12210211210121 is 12101211201221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9371778104896 + 2838433105225 = 3061336^2 + 1684765^2 .

It is a cyclic number.

It is not a de Polignac number, because 12210211210121 - 2² = 12210211210117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12210211210121.

It is not a weakly prime, because it can be changed into another prime (12210211210151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105105605060 + 6105105605061.

It is an arithmetic number, because the mean of its divisors is an integer number (6105105605061).

Almost surely, 2^{12210211210121} is an apocalyptic number.

It is an amenable number.

12210211210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12210211210121 is an equidigital number, since it uses as much as digits as its factorization.

12210211210121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 12210211210121 its reverse (12101211201221), we get a palindrome (24311422411342).

The spelling of 12210211210121 in words is "twelve trillion, two hundred ten billion, two hundred eleven million, two hundred ten thousand, one hundred twenty-one".