20711100111217 has 2 divisors, whose sum is σ = 20711100111218. Its totient is φ = 20711100111216.

The previous prime is 20711100111181. The next prime is 20711100111257. The reversal of 20711100111217 is 71211100111702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19685895260641 + 1025204850576 = 4436879^2 + 1012524^2 .

It is a cyclic number.

It is not a de Polignac number, because 20711100111217 - 2³⁹ = 20161344297329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20711100111191 and 20711100111200.

It is not a weakly prime, because it can be changed into another prime (20711100111257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10355550055608 + 10355550055609.

It is an arithmetic number, because the mean of its divisors is an integer number (10355550055609).

Almost surely, 2^{20711100111217} is an apocalyptic number.

It is an amenable number.

20711100111217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20711100111217 is an equidigital number, since it uses as much as digits as its factorization.

20711100111217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 196, while the sum is 25.

Adding to 20711100111217 its reverse (71211100111702), we get a palindrome (91922200222919).

The spelling of 20711100111217 in words is "twenty trillion, seven hundred eleven billion, one hundred million, one hundred eleven thousand, two hundred seventeen".