21110202001171 has 2 divisors, whose sum is σ = 21110202001172. Its totient is φ = 21110202001170.

The previous prime is 21110202001129. The next prime is 21110202001277. The reversal of 21110202001171 is 17110020201112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110202001171 is a prime.

It is not a weakly prime, because it can be changed into another prime (21110202005171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555101000585 + 10555101000586.

It is an arithmetic number, because the mean of its divisors is an integer number (10555101000586).

Almost surely, 2^{21110202001171} is an apocalyptic number.

21110202001171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110202001171 is an equidigital number, since it uses as much as digits as its factorization.

21110202001171 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 19.

Adding to 21110202001171 its reverse (17110020201112), we get a palindrome (38220222202283).

The spelling of 21110202001171 in words is "twenty-one trillion, one hundred ten billion, two hundred two million, one thousand, one hundred seventy-one".