2120220111181 has 2 divisors, whose sum is σ = 2120220111182. Its totient is φ = 2120220111180.

The previous prime is 2120220111161. The next prime is 2120220111187. The reversal of 2120220111181 is 1811110220212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1481171757156 + 639048354025 = 1217034^2 + 799405^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120220111181 - 2¹⁵ = 2120220078413 is a prime.

It is a super-3 number, since 3×2120220111181³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120220111187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060110055590 + 1060110055591.

It is an arithmetic number, because the mean of its divisors is an integer number (1060110055591).

Almost surely, 2^{2120220111181} is an apocalyptic number.

It is an amenable number.

2120220111181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120220111181 is an equidigital number, since it uses as much as digits as its factorization.

2120220111181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 22.

Adding to 2120220111181 its reverse (1811110220212), we get a palindrome (3931330331393).

The spelling of 2120220111181 in words is "two trillion, one hundred twenty billion, two hundred twenty million, one hundred eleven thousand, one hundred eighty-one".