1211101000009 has 2 divisors, whose sum is σ = 1211101000010. Its totient is φ = 1211101000008.

The previous prime is 1211100999971. The next prime is 1211101000013. The reversal of 1211101000009 is 9000001011121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 950679600784 + 260421399225 = 975028^2 + 510315^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211101000009 - 2¹⁹ = 1211100475721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211100999956 and 1211101000001.

It is not a weakly prime, because it can be changed into another prime (1211101000709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605550500004 + 605550500005.

It is an arithmetic number, because the mean of its divisors is an integer number (605550500005).

Almost surely, 2^{1211101000009} is an apocalyptic number.

It is an amenable number.

1211101000009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211101000009 is an equidigital number, since it uses as much as digits as its factorization.

1211101000009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 16.

The spelling of 1211101000009 in words is "one trillion, two hundred eleven billion, one hundred one million, nine", and thus it is an aban number.