211212000000209 has 4 divisors (see below), whose sum is σ = 227459076923316. Its totient is φ = 194964923077104.

The previous prime is 211212000000167. The next prime is 211212000000241. The reversal of 211212000000209 is 902000000212112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50220565702609 + 160991434297600 = 7086647^2 + 12688240^2 .

It is a cyclic number.

It is not a de Polignac number, because 211212000000209 - 2²⁴ = 211211983222993 is a prime.

It is a super-2 number, since 2×211212000000209² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211212000000269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8123538461534 + ... + 8123538461559.

It is an arithmetic number, because the mean of its divisors is an integer number (56864769230829).

Almost surely, 2^{211212000000209} is an apocalyptic number.

It is an amenable number.

211212000000209 is a deficient number, since it is larger than the sum of its proper divisors (16247076923107).

211212000000209 is a wasteful number, since it uses less digits than its factorization.

211212000000209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16247076923106.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 211212000000209 in words is "two hundred eleven trillion, two hundred twelve billion, two hundred nine", and thus it is an aban number.