2172123967 has 4 divisors (see below), whose sum is σ = 2339210440. Its totient is φ = 2005037496.

The previous prime is 2172123959. The next prime is 2172123971. The reversal of 2172123967 is 7693212712.

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 2172123967 - 2³ = 2172123959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172123907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83543217 + ... + 83543242.

It is an arithmetic number, because the mean of its divisors is an integer number (584802610).

Almost surely, 2^2172123967 is an apocalyptic number.

2172123967 is a deficient number, since it is larger than the sum of its proper divisors (167086473).

2172123967 is a wasteful number, since it uses less digits than its factorization.

2172123967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167086472.

The product of its digits is 63504, while the sum is 40.

The square root of 2172123967 is about 46606.0507552399. The cubic root of 2172123967 is about 1295.0748488612.

The spelling of 2172123967 in words is "two billion, one hundred seventy-two million, one hundred twenty-three thousand, nine hundred sixty-seven".