2121330209 has 4 divisors (see below), whose sum is σ = 2130675504. Its totient is φ = 2111984916.

The previous prime is 2121330187. The next prime is 2121330229. The reversal of 2121330209 is 9020331212.

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 2121330209 - 2⁸ = 2121329953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121330229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4672307 + ... + 4672760.

It is an arithmetic number, because the mean of its divisors is an integer number (532668876).

Almost surely, 2^2121330209 is an apocalyptic number.

It is an amenable number.

2121330209 is a deficient number, since it is larger than the sum of its proper divisors (9345295).

2121330209 is an equidigital number, since it uses as much as digits as its factorization.

2121330209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9345294.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 2121330209 is about 46057.9006143354. The cubic root of 2121330209 is about 1284.9002852772.

The spelling of 2121330209 in words is "two billion, one hundred twenty-one million, three hundred thirty thousand, two hundred nine".