2123109 has 6 divisors (see below), whose sum is σ = 3066726. Its totient is φ = 1415400.

The previous prime is 2123087. The next prime is 2123123. The reversal of 2123109 is 9013212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2117025 + 6084 = 1455^2 + 78^2 .

It is not a de Polignac number, because 2123109 - 2⁸ = 2122853 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2123091 and 2123100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117942 + ... + 117959.

It is an arithmetic number, because the mean of its divisors is an integer number (511121).

2^2123109 is an apocalyptic number.

It is an amenable number.

2123109 is a deficient number, since it is larger than the sum of its proper divisors (943617).

2123109 is a wasteful number, since it uses less digits than its factorization.

2123109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235907 (or 235904 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 2123109 is about 1457.0892217020. The cubic root of 2123109 is about 128.5259325800.

It can be divided in two parts, 212 and 3109, that added together give a triangular number (3321 = T₈₁).

The spelling of 2123109 in words is "two million, one hundred twenty-three thousand, one hundred nine".