1212200211221 has 2 divisors, whose sum is σ = 1212200211222. Its totient is φ = 1212200211220.

The previous prime is 1212200211203. The next prime is 1212200211239. The reversal of 1212200211221 is 1221120022121.

It is a balanced prime because it is at equal distance from previous prime (1212200211203) and next prime (1212200211239).

It can be written as a sum of positive squares in only one way, i.e., 959447676196 + 252752535025 = 979514^2 + 502745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212200211221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212200211221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212200211721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606100105610 + 606100105611.

It is an arithmetic number, because the mean of its divisors is an integer number (606100105611).

Almost surely, 2^{1212200211221} is an apocalyptic number.

It is an amenable number.

1212200211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212200211221 is an equidigital number, since it uses as much as digits as its factorization.

1212200211221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1212200211221 its reverse (1221120022121), we get a palindrome (2433320233342).

The spelling of 1212200211221 in words is "one trillion, two hundred twelve billion, two hundred million, two hundred eleven thousand, two hundred twenty-one".