1212221011121 has 2 divisors, whose sum is σ = 1212221011122. Its totient is φ = 1212221011120.

The previous prime is 1212221011061. The next prime is 1212221011163. The reversal of 1212221011121 is 1211101222121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 919036664896 + 293184346225 = 958664^2 + 541465^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212221011121 - 2¹⁴ = 1212220994737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212221011121.

It is not a weakly prime, because it can be changed into another prime (1212221011181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606110505560 + 606110505561.

It is an arithmetic number, because the mean of its divisors is an integer number (606110505561).

Almost surely, 2^{1212221011121} is an apocalyptic number.

It is an amenable number.

1212221011121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212221011121 is an equidigital number, since it uses as much as digits as its factorization.

1212221011121 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 1212221011121 its reverse (1211101222121), we get a palindrome (2423322233242).

The spelling of 1212221011121 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, eleven thousand, one hundred twenty-one".