20011120201181 has 2 divisors, whose sum is σ = 20011120201182. Its totient is φ = 20011120201180.

The previous prime is 20011120201153. The next prime is 20011120201249. The reversal of 20011120201181 is 18110202111002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10522465507225 + 9488654693956 = 3243835^2 + 3080366^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011120201181 - 2⁴² = 15613073690077 is a prime.

It is a super-2 number, since 2×20011120201181² (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 (20011122201181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005560100590 + 10005560100591.

It is an arithmetic number, because the mean of its divisors is an integer number (10005560100591).

Almost surely, 2^{20011120201181} is an apocalyptic number.

It is an amenable number.

20011120201181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011120201181 is an equidigital number, since it uses as much as digits as its factorization.

20011120201181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 20011120201181 its reverse (18110202111002), we get a palindrome (38121322312183).

The spelling of 20011120201181 in words is "twenty trillion, eleven billion, one hundred twenty million, two hundred one thousand, one hundred eighty-one".