211211202109 has 2 divisors, whose sum is σ = 211211202110. Its totient is φ = 211211202108.

The previous prime is 211211202107. The next prime is 211211202161. The reversal of 211211202109 is 901202112112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207523069209 + 3688132900 = 455547^2 + 60730^2 .

It is a cyclic number.

It is not a de Polignac number, because 211211202109 - 2¹ = 211211202107 is a prime.

It is a super-2 number, since 2×211211202109² (a number of 23 digits) contains 22 as substring.

Together with 211211202107, 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 211211202109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211211202101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105605601054 + 105605601055.

It is an arithmetic number, because the mean of its divisors is an integer number (105605601055).

Almost surely, 2^211211202109 is an apocalyptic number.

It is an amenable number.

211211202109 is a deficient number, since it is larger than the sum of its proper divisors (1).

211211202109 is an equidigital number, since it uses as much as digits as its factorization.

211211202109 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 211211202109 in words is "two hundred eleven billion, two hundred eleven million, two hundred two thousand, one hundred nine".