211200110000009 has 4 divisors (see below), whose sum is σ = 227446272307716. Its totient is φ = 194953947692304.

The previous prime is 211200109999981. The next prime is 211200110000017. The reversal of 211200110000009 is 900000011002112.

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 21129908305984 + 190070201694025 = 4596728^2 + 13786595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211200110000009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211200110000029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8123081153834 + ... + 8123081153859.

It is an arithmetic number, because the mean of its divisors is an integer number (56861568076929).

Almost surely, 2^{211200110000009} is an apocalyptic number.

It is an amenable number.

211200110000009 is a deficient number, since it is larger than the sum of its proper divisors (16246162307707).

211200110000009 is a wasteful number, since it uses less digits than its factorization.

211200110000009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16246162307706.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 211200110000009 in words is "two hundred eleven trillion, two hundred billion, one hundred ten million, nine", and thus it is an aban number.