2172105667 has 4 divisors (see below), whose sum is σ = 2225083896. Its totient is φ = 2119127440.

The previous prime is 2172105641. The next prime is 2172105739. The reversal of 2172105667 is 7665012712.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2172105667 is a prime.

It is a super-2 number, since 2×2172105667² = 9436086057227029778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2172105167) 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 3 ways as a sum of consecutive naturals, for example, 26489053 + ... + 26489134.

It is an arithmetic number, because the mean of its divisors is an integer number (556270974).

Almost surely, 2^2172105667 is an apocalyptic number.

2172105667 is a deficient number, since it is larger than the sum of its proper divisors (52978229).

2172105667 is an equidigital number, since it uses as much as digits as its factorization.

2172105667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52978228.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 2172105667 is about 46605.8544283870. The cubic root of 2172105667 is about 1295.0712118778.

The spelling of 2172105667 in words is "two billion, one hundred seventy-two million, one hundred five thousand, six hundred sixty-seven".