2123031209 has 16 divisors (see below), whose sum is σ = 2347201920. Its totient is φ = 1907763840.

The previous prime is 2123031193. The next prime is 2123031223. The reversal of 2123031209 is 9021303212.

It is a cyclic number.

It is not a de Polignac number, because 2123031209 - 2⁴ = 2123031193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123031109) 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 15 ways as a sum of consecutive naturals, for example, 255482 + ... + 263660.

It is an arithmetic number, because the mean of its divisors is an integer number (146700120).

Almost surely, 2^2123031209 is an apocalyptic number.

It is an amenable number.

2123031209 is a deficient number, since it is larger than the sum of its proper divisors (224170711).

2123031209 is a wasteful number, since it uses less digits than its factorization.

2123031209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8720.

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

The square root of 2123031209 is about 46076.3628013323. The cubic root of 2123031209 is about 1285.2436282504.

The spelling of 2123031209 in words is "two billion, one hundred twenty-three million, thirty-one thousand, two hundred nine".