1211210102209 has 2 divisors, whose sum is σ = 1211210102210. Its totient is φ = 1211210102208.

The previous prime is 1211210102171. The next prime is 1211210102273. The reversal of 1211210102209 is 9022010121121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 949728211600 + 261481890609 = 974540^2 + 511353^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211210102209 - 2²⁷ = 1211075884481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211210102209.

It is not a weakly prime, because it can be changed into another prime (1211210102279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605605051104 + 605605051105.

It is an arithmetic number, because the mean of its divisors is an integer number (605605051105).

Almost surely, 2^{1211210102209} is an apocalyptic number.

It is an amenable number.

1211210102209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211210102209 is an equidigital number, since it uses as much as digits as its factorization.

1211210102209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 1211210102209 in words is "one trillion, two hundred eleven billion, two hundred ten million, one hundred two thousand, two hundred nine".