20111102171 has 2 divisors, whose sum is σ = 20111102172. Its totient is φ = 20111102170.

The previous prime is 20111102129. The next prime is 20111102183. The reversal of 20111102171 is 17120111102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111102171 is a prime.

It is not a weakly prime, because it can be changed into another prime (20111102111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055551085 + 10055551086.

It is an arithmetic number, because the mean of its divisors is an integer number (10055551086).

Almost surely, 2^20111102171 is an apocalyptic number.

20111102171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111102171 is an equidigital number, since it uses as much as digits as its factorization.

20111102171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 17.

Adding to 20111102171 its reverse (17120111102), we get a palindrome (37231213273).

The spelling of 20111102171 in words is "twenty billion, one hundred eleven million, one hundred two thousand, one hundred seventy-one".