211202020109 has 2 divisors, whose sum is σ = 211202020110. Its totient is φ = 211202020108.

The previous prime is 211202020093. The next prime is 211202020111. The reversal of 211202020109 is 901020202112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165653070025 + 45548950084 = 407005^2 + 213422^2 .

It is a cyclic number.

It is not a de Polignac number, because 211202020109 - 2⁴ = 211202020093 is a prime.

Together with 211202020111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211202020189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105601010054 + 105601010055.

It is an arithmetic number, because the mean of its divisors is an integer number (105601010055).

Almost surely, 2^211202020109 is an apocalyptic number.

It is an amenable number.

211202020109 is a deficient number, since it is larger than the sum of its proper divisors (1).

211202020109 is an equidigital number, since it uses as much as digits as its factorization.

211202020109 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 20.

The spelling of 211202020109 in words is "two hundred eleven billion, two hundred two million, twenty thousand, one hundred nine".