210002009 has 4 divisors (see below), whose sum is σ = 240002304. Its totient is φ = 180001716.

The previous prime is 210001951. The next prime is 210002069. The reversal of 210002009 is 900200012.

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 210002009 - 2¹⁶ = 209936473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210001984 and 210002002.

It is not an unprimeable number, because it can be changed into a prime (210002069) 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, 15000137 + ... + 15000150.

It is an arithmetic number, because the mean of its divisors is an integer number (60000576).

Almost surely, 2^210002009 is an apocalyptic number.

It is an amenable number.

210002009 is a deficient number, since it is larger than the sum of its proper divisors (30000295).

210002009 is an equidigital number, since it uses as much as digits as its factorization.

210002009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30000294.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 210002009 is about 14491.4460631091. The cubic root of 210002009 is about 594.3940907209.

The spelling of 210002009 in words is "two hundred ten million, two thousand, nine".