2171072172265 has 16 divisors (see below), whose sum is σ = 2742444443520. Its totient is φ = 1645421679360.

The previous prime is 2171072172257. The next prime is 2171072172289. The reversal of 2171072172265 is 5622712701712.

It is not a de Polignac number, because 2171072172265 - 2³ = 2171072172257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11005932 + ... + 11201458.

It is an arithmetic number, because the mean of its divisors is an integer number (171402777720).

Almost surely, 2^{2171072172265} is an apocalyptic number.

It is an amenable number.

2171072172265 is a deficient number, since it is larger than the sum of its proper divisors (571372271255).

2171072172265 is a wasteful number, since it uses less digits than its factorization.

2171072172265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312432.

The product of its (nonzero) digits is 164640, while the sum is 43.

Adding to 2171072172265 its reverse (5622712701712), we get a palindrome (7793784873977).

The spelling of 2171072172265 in words is "two trillion, one hundred seventy-one billion, seventy-two million, one hundred seventy-two thousand, two hundred sixty-five".