1211002212109 has 2 divisors, whose sum is σ = 1211002212110. Its totient is φ = 1211002212108.

The previous prime is 1211002212107. The next prime is 1211002212113. The reversal of 1211002212109 is 9012122001121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1052669844009 + 158332368100 = 1025997^2 + 397910^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211002212109 - 2¹ = 1211002212107 is a prime.

Together with 1211002212107, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1211002212109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211002212107) 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, 605501106054 + 605501106055.

It is an arithmetic number, because the mean of its divisors is an integer number (605501106055).

Almost surely, 2^{1211002212109} is an apocalyptic number.

It is an amenable number.

1211002212109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211002212109 is an equidigital number, since it uses as much as digits as its factorization.

1211002212109 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 22.

The spelling of 1211002212109 in words is "one trillion, two hundred eleven billion, two million, two hundred twelve thousand, one hundred nine".