20210111100181 has 2 divisors, whose sum is σ = 20210111100182. Its totient is φ = 20210111100180.

The previous prime is 20210111100169. The next prime is 20210111100217. The reversal of 20210111100181 is 18100111101202.

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., 12138318712081 + 8071792388100 = 3484009^2 + 2841090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20210111100181 is a prime.

It is a super-3 number, since 3×20210111100181³ (a number of 41 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 (20210111100131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105055550090 + 10105055550091.

It is an arithmetic number, because the mean of its divisors is an integer number (10105055550091).

Almost surely, 2^{20210111100181} is an apocalyptic number.

It is an amenable number.

20210111100181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210111100181 is an equidigital number, since it uses as much as digits as its factorization.

20210111100181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 20210111100181 its reverse (18100111101202), we get a palindrome (38310222201383).

The spelling of 20210111100181 in words is "twenty trillion, two hundred ten billion, one hundred eleven million, one hundred thousand, one hundred eighty-one".