2102209 has 4 divisors (see below), whose sum is σ = 2105280. Its totient is φ = 2099140.

The previous prime is 2102207. The next prime is 2102213. The reversal of 2102209 is 9022012.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2102209 - 2¹ = 2102207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102192 and 2102201.

It is not an unprimeable number, because it can be changed into a prime (2102201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12 + ... + 2050.

It is an arithmetic number, because the mean of its divisors is an integer number (526320).

2^2102209 is an apocalyptic number.

It is an amenable number.

2102209 is a deficient number, since it is larger than the sum of its proper divisors (3071).

2102209 is a wasteful number, since it uses less digits than its factorization.

2102209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3070.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2102209 is about 1449.8996517001. The cubic root of 2102209 is about 128.1028023413.

The spelling of 2102209 in words is "two million, one hundred two thousand, two hundred nine".