21202101101171 has 2 divisors, whose sum is σ = 21202101101172. Its totient is φ = 21202101101170.

The previous prime is 21202101101063. The next prime is 21202101101191. The reversal of 21202101101171 is 17110110120212.

It is a happy number.

It is an a-pointer prime, because the next prime (21202101101191) can be obtained adding 21202101101171 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21202101101171 - 2¹⁸ = 21202100839027 is a prime.

It is a super-2 number, since 2×21202101101171² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21202101101191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601050550585 + 10601050550586.

It is an arithmetic number, because the mean of its divisors is an integer number (10601050550586).

Almost surely, 2^{21202101101171} is an apocalyptic number.

21202101101171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202101101171 is an equidigital number, since it uses as much as digits as its factorization.

21202101101171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 20.

Adding to 21202101101171 its reverse (17110110120212), we get a palindrome (38312211221383).

The spelling of 21202101101171 in words is "twenty-one trillion, two hundred two billion, one hundred one million, one hundred one thousand, one hundred seventy-one".