2123177209 has 4 divisors (see below), whose sum is σ = 2248070004. Its totient is φ = 1998284416.

The previous prime is 2123177131. The next prime is 2123177269. The reversal of 2123177209 is 9027713212.

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 1853560809 + 269616400 = 43053^2 + 16420^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123177209 - 2¹¹ = 2123175161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2123177269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62446372 + ... + 62446405.

It is an arithmetic number, because the mean of its divisors is an integer number (562017501).

Almost surely, 2^2123177209 is an apocalyptic number.

It is an amenable number.

2123177209 is a deficient number, since it is larger than the sum of its proper divisors (124892795).

2123177209 is a wasteful number, since it uses less digits than its factorization.

2123177209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124892794.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 2123177209 is about 46077.9471005382. The cubic root of 2123177209 is about 1285.2730894703.

The spelling of 2123177209 in words is "two billion, one hundred twenty-three million, one hundred seventy-seven thousand, two hundred nine".