2171827428917 has 2 divisors, whose sum is σ = 2171827428918. Its totient is φ = 2171827428916.

The previous prime is 2171827428871. The next prime is 2171827428941. The reversal of 2171827428917 is 7198247281712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2010925361041 + 160902067876 = 1418071^2 + 401126^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171827428917 - 2²⁰ = 2171826380341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2171827424917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085913714458 + 1085913714459.

It is an arithmetic number, because the mean of its divisors is an integer number (1085913714459).

Almost surely, 2^{2171827428917} is an apocalyptic number.

It is an amenable number.

2171827428917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171827428917 is an equidigital number, since it uses as much as digits as its factorization.

2171827428917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6322176, while the sum is 59.

The spelling of 2171827428917 in words is "two trillion, one hundred seventy-one billion, eight hundred twenty-seven million, four hundred twenty-eight thousand, nine hundred seventeen".