2172161207 has 4 divisors (see below), whose sum is σ = 2172256800. Its totient is φ = 2172065616.

The previous prime is 2172161113. The next prime is 2172161231. The reversal of 2172161207 is 7021612712.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2172161207 - 2¹⁰ = 2172160183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2172161207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172161237) 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, 8003 + ... + 66395.

It is an arithmetic number, because the mean of its divisors is an integer number (543064200).

Almost surely, 2^2172161207 is an apocalyptic number.

2172161207 is a deficient number, since it is larger than the sum of its proper divisors (95593).

2172161207 is an equidigital number, since it uses as much as digits as its factorization.

2172161207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95592.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 2172161207 is about 46606.4502724677. The cubic root of 2172161207 is about 1295.0822499599.

Adding to 2172161207 its reverse (7021612712), we get a palindrome (9193773919).

It can be divided in two parts, 21721 and 61207, that added together give a palindrome (82928).

The spelling of 2172161207 in words is "two billion, one hundred seventy-two million, one hundred sixty-one thousand, two hundred seven".