2102120209 has 8 divisors (see below), whose sum is σ = 2417163200. Its totient is φ = 1790762256.

The previous prime is 2102120201. The next prime is 2102120221. The reversal of 2102120209 is 9020212012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2102120209 - 2³ = 2102120201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2102120201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 920034 + ... + 922315.

It is an arithmetic number, because the mean of its divisors is an integer number (302145400).

Almost surely, 2^2102120209 is an apocalyptic number.

It is an amenable number.

2102120209 is a deficient number, since it is larger than the sum of its proper divisors (315042991).

2102120209 is a wasteful number, since it uses less digits than its factorization.

2102120209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842519.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 2102120209 is about 45848.8844902469. The cubic root of 2102120209 is about 1281.0099875655.

The spelling of 2102120209 in words is "two billion, one hundred two million, one hundred twenty thousand, two hundred nine".