1211011320209 has 2 divisors, whose sum is σ = 1211011320210. Its totient is φ = 1211011320208.

The previous prime is 1211011320199. The next prime is 1211011320217. The reversal of 1211011320209 is 9020231101121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 678600307984 + 532411012225 = 823772^2 + 729665^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211011320209 - 2⁴⁰ = 111499692433 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1211011320109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605505660104 + 605505660105.

It is an arithmetic number, because the mean of its divisors is an integer number (605505660105).

Almost surely, 2^{1211011320209} is an apocalyptic number.

It is an amenable number.

1211011320209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211011320209 is an equidigital number, since it uses as much as digits as its factorization.

1211011320209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 1211011320209 in words is "one trillion, two hundred eleven billion, eleven million, three hundred twenty thousand, two hundred nine".