20001122171 has 2 divisors, whose sum is σ = 20001122172. Its totient is φ = 20001122170.

The previous prime is 20001122093. The next prime is 20001122249. The reversal of 20001122171 is 17122110002.

It is a balanced prime because it is at equal distance from previous prime (20001122093) and next prime (20001122249).

It is a cyclic number.

It is not a de Polignac number, because 20001122171 - 2¹⁸ = 20000860027 is a prime.

It is not a weakly prime, because it can be changed into another prime (20001125171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000561085 + 10000561086.

It is an arithmetic number, because the mean of its divisors is an integer number (10000561086).

Almost surely, 2^20001122171 is an apocalyptic number.

20001122171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001122171 is an equidigital number, since it uses as much as digits as its factorization.

20001122171 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 17.

Adding to 20001122171 its reverse (17122110002), we get a palindrome (37123232173).

The spelling of 20001122171 in words is "twenty billion, one million, one hundred twenty-two thousand, one hundred seventy-one".