2173723211 has 4 divisors (see below), whose sum is σ = 2371334424. Its totient is φ = 1976112000.

The previous prime is 2173723151. The next prime is 2173723213. The reversal of 2173723211 is 1123273712.

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

It is a cyclic number.

It is not a de Polignac number, because 2173723211 - 2⁶ = 2173723147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2173723213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98805590 + ... + 98805611.

It is an arithmetic number, because the mean of its divisors is an integer number (592833606).

Almost surely, 2^2173723211 is an apocalyptic number.

2173723211 is a deficient number, since it is larger than the sum of its proper divisors (197611213).

2173723211 is a wasteful number, since it uses less digits than its factorization.

2173723211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197611212.

The product of its digits is 3528, while the sum is 29.

The square root of 2173723211 is about 46623.2046410368. The cubic root of 2173723211 is about 1295.3926073659.

Adding to 2173723211 its reverse (1123273712), we get a palindrome (3296996923).

The spelling of 2173723211 in words is "two billion, one hundred seventy-three million, seven hundred twenty-three thousand, two hundred eleven".