1212121112201 has 2 divisors, whose sum is σ = 1212121112202. Its totient is φ = 1212121112200.

The previous prime is 1212121112179. The next prime is 1212121112207. The reversal of 1212121112201 is 1022111212121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1187140993600 + 24980118601 = 1089560^2 + 158051^2 .

It is an emirp because it is prime and its reverse (1022111212121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212121112201 - 2²² = 1212116917897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212121112201.

It is not a weakly prime, because it can be changed into another prime (1212121112207) 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, 606060556100 + 606060556101.

It is an arithmetic number, because the mean of its divisors is an integer number (606060556101).

Almost surely, 2^{1212121112201} is an apocalyptic number.

It is an amenable number.

1212121112201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212121112201 is an equidigital number, since it uses as much as digits as its factorization.

1212121112201 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 1212121112201 its reverse (1022111212121), we get a palindrome (2234232324322).

The spelling of 1212121112201 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, one hundred twelve thousand, two hundred one".