20711100111181 has 2 divisors, whose sum is σ = 20711100111182. Its totient is φ = 20711100111180.

The previous prime is 20711100111139. The next prime is 20711100111217. The reversal of 20711100111181 is 18111100111702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16771236372900 + 3939863738281 = 4095270^2 + 1984909^2 .

It is a cyclic number.

It is not a de Polignac number, because 20711100111181 - 2¹⁵ = 20711100078413 is a prime.

It is a super-2 number, since 2×20711100111181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20711100111781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10355550055590 + 10355550055591.

It is an arithmetic number, because the mean of its divisors is an integer number (10355550055591).

Almost surely, 2^{20711100111181} is an apocalyptic number.

It is an amenable number.

20711100111181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20711100111181 is an equidigital number, since it uses as much as digits as its factorization.

20711100111181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 25.

Adding to 20711100111181 its reverse (18111100111702), we get a palindrome (38822200222883).

The spelling of 20711100111181 in words is "twenty trillion, seven hundred eleven billion, one hundred million, one hundred eleven thousand, one hundred eighty-one".