2085209121 has 4 divisors (see below), whose sum is σ = 2780278832. Its totient is φ = 1390139412.

The previous prime is 2085209117. The next prime is 2085209221. The reversal of 2085209121 is 1219025802.

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 not a de Polignac number, because 2085209121 - 2² = 2085209117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2085209101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347534851 + ... + 347534856.

It is an arithmetic number, because the mean of its divisors is an integer number (695069708).

Almost surely, 2^2085209121 is an apocalyptic number.

It is an amenable number.

2085209121 is a deficient number, since it is larger than the sum of its proper divisors (695069711).

2085209121 is an equidigital number, since it uses as much as digits as its factorization.

2085209121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695069710.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 2085209121 is about 45664.0900599147. The cubic root of 2085209121 is about 1277.5655880123.

The spelling of 2085209121 in words is "two billion, eighty-five million, two hundred nine thousand, one hundred twenty-one".