1212011212121 has 2 divisors, whose sum is σ = 1212011212122. Its totient is φ = 1212011212120.

The previous prime is 1212011212079. The next prime is 1212011212211. The reversal of 1212011212121 is 1212121102121.

Together with next prime (1212011212211) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 969317042521 + 242694169600 = 984539^2 + 492640^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212011212121 - 2¹⁰ = 1212011211097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212011212121.

It is not a weakly prime, because it can be changed into another prime (1212011212421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606005606060 + 606005606061.

It is an arithmetic number, because the mean of its divisors is an integer number (606005606061).

Almost surely, 2^{1212011212121} is an apocalyptic number.

It is an amenable number.

1212011212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212011212121 is an equidigital number, since it uses as much as digits as its factorization.

1212011212121 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 1212011212121 its reverse (1212121102121), we get a palindrome (2424132314242).

The spelling of 1212011212121 in words is "one trillion, two hundred twelve billion, eleven million, two hundred twelve thousand, one hundred twenty-one".