2171257111 has 2 divisors, whose sum is σ = 2171257112. Its totient is φ = 2171257110.

The previous prime is 2171257069. The next prime is 2171257133. The reversal of 2171257111 is 1117521712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2171257111 - 2¹⁷ = 2171126039 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2171257111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2171257181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085628555 + 1085628556.

It is an arithmetic number, because the mean of its divisors is an integer number (1085628556).

Almost surely, 2^2171257111 is an apocalyptic number.

2171257111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171257111 is an equidigital number, since it uses as much as digits as its factorization.

2171257111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 980, while the sum is 28.

The square root of 2171257111 is about 46596.7500046945. The cubic root of 2171257111 is about 1294.9025455004.

Adding to 2171257111 its reverse (1117521712), we get a palindrome (3288778823).

The spelling of 2171257111 in words is "two billion, one hundred seventy-one million, two hundred fifty-seven thousand, one hundred eleven".