2112120209 has 4 divisors (see below), whose sum is σ = 2112460260. Its totient is φ = 2111780160.

The previous prime is 2112120191. The next prime is 2112120223. The reversal of 2112120209 is 9020212112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1675101184 + 437019025 = 40928^2 + 20905^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112120209 - 2¹⁶ = 2112054673 is a prime.

It is a super-2 number, since 2×2112120209² = 8922103554532407362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2112120229) 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, 160532 + ... + 173189.

It is an arithmetic number, because the mean of its divisors is an integer number (528115065).

Almost surely, 2^2112120209 is an apocalyptic number.

It is an amenable number.

2112120209 is a deficient number, since it is larger than the sum of its proper divisors (340051).

2112120209 is an equidigital number, since it uses as much as digits as its factorization.

2112120209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340050.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 2112120209 is about 45957.8090100039. The cubic root of 2112120209 is about 1283.0380733607.

The spelling of 2112120209 in words is "two billion, one hundred twelve million, one hundred twenty thousand, two hundred nine".