2101200209 has 4 divisors (see below), whose sum is σ = 2127797760. Its totient is φ = 2074602660.

The previous prime is 2101200197. The next prime is 2101200319. The reversal of 2101200209 is 9020021012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2101200209 - 2²⁰ = 2100151633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101200509) 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, 13298657 + ... + 13298814.

It is an arithmetic number, because the mean of its divisors is an integer number (531949440).

Almost surely, 2^2101200209 is an apocalyptic number.

It is an amenable number.

2101200209 is a deficient number, since it is larger than the sum of its proper divisors (26597551).

2101200209 is an equidigital number, since it uses as much as digits as its factorization.

2101200209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26597550.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 2101200209 is about 45838.8504327934. The cubic root of 2101200209 is about 1280.8230808488.

The spelling of 2101200209 in words is "two billion, one hundred one million, two hundred thousand, two hundred nine".