20011102171 has 2 divisors, whose sum is σ = 20011102172. Its totient is φ = 20011102170.

The previous prime is 20011102159. The next prime is 20011102249. The reversal of 20011102171 is 17120111002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011102171 is a prime.

It is not a weakly prime, because it can be changed into another prime (20011402171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005551085 + 10005551086.

It is an arithmetic number, because the mean of its divisors is an integer number (10005551086).

Almost surely, 2^20011102171 is an apocalyptic number.

20011102171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011102171 is an equidigital number, since it uses as much as digits as its factorization.

20011102171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 16.

Adding to 20011102171 its reverse (17120111002), we get a palindrome (37131213173).

The spelling of 20011102171 in words is "twenty billion, eleven million, one hundred two thousand, one hundred seventy-one".