211020102111109 has 2 divisors, whose sum is σ = 211020102111110. Its totient is φ = 211020102111108.

The previous prime is 211020102111101. The next prime is 211020102111139. The reversal of 211020102111109 is 901111201020112.

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., 164673620880484 + 46346481230625 = 12832522^2 + 6807825^2 .

It is a cyclic number.

It is not a de Polignac number, because 211020102111109 - 2³ = 211020102111101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211020102111109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211020102111101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105510051055554 + 105510051055555.

It is an arithmetic number, because the mean of its divisors is an integer number (105510051055555).

Almost surely, 2^{211020102111109} is an apocalyptic number.

It is an amenable number.

211020102111109 is a deficient number, since it is larger than the sum of its proper divisors (1).

211020102111109 is an equidigital number, since it uses as much as digits as its factorization.

211020102111109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 211020102111109 in words is "two hundred eleven trillion, twenty billion, one hundred two million, one hundred eleven thousand, one hundred nine".