1200111210121 has 2 divisors, whose sum is σ = 1200111210122. Its totient is φ = 1200111210120.

The previous prime is 1200111210097. The next prime is 1200111210163. The reversal of 1200111210121 is 1210121110021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1197547205625 + 2564004496 = 1094325^2 + 50636^2 .

It is an emirp because it is prime and its reverse (1210121110021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1200111210121 - 2¹⁷ = 1200111079049 is a prime.

It is not a weakly prime, because it can be changed into another prime (1200111210721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600055605060 + 600055605061.

It is an arithmetic number, because the mean of its divisors is an integer number (600055605061).

Almost surely, 2^{1200111210121} is an apocalyptic number.

It is an amenable number.

1200111210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200111210121 is an equidigital number, since it uses as much as digits as its factorization.

1200111210121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1200111210121 its reverse (1210121110021), we get a palindrome (2410232320142).

The spelling of 1200111210121 in words is "one trillion, two hundred billion, one hundred eleven million, two hundred ten thousand, one hundred twenty-one".