1212311021099 has 2 divisors, whose sum is σ = 1212311021100. Its totient is φ = 1212311021098.

The previous prime is 1212311021081. The next prime is 1212311021143. The reversal of 1212311021099 is 9901201132121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212311021099 - 2¹² = 1212311017003 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212311021029) 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, 606155510549 + 606155510550.

It is an arithmetic number, because the mean of its divisors is an integer number (606155510550).

Almost surely, 2^{1212311021099} is an apocalyptic number.

1212311021099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212311021099 is an equidigital number, since it uses as much as digits as its factorization.

1212311021099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 32.

The spelling of 1212311021099 in words is "one trillion, two hundred twelve billion, three hundred eleven million, twenty-one thousand, ninety-nine".