1212201000209 has 2 divisors, whose sum is σ = 1212201000210. Its totient is φ = 1212201000208.

The previous prime is 1212201000187. The next prime is 1212201000253. The reversal of 1212201000209 is 9020001022121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 964968299584 + 247232700625 = 982328^2 + 497225^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212201000209 - 2²⁴ = 1212184222993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212201000509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606100500104 + 606100500105.

It is an arithmetic number, because the mean of its divisors is an integer number (606100500105).

Almost surely, 2^{1212201000209} is an apocalyptic number.

It is an amenable number.

1212201000209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212201000209 is an equidigital number, since it uses as much as digits as its factorization.

1212201000209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 1212201000209 in words is "one trillion, two hundred twelve billion, two hundred one million, two hundred nine", and thus it is an aban number.