100201202111981 has 2 divisors, whose sum is σ = 100201202111982. Its totient is φ = 100201202111980.

The previous prime is 100201202111971. The next prime is 100201202112017. The reversal of 100201202111981 is 189111202102001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67832783156356 + 32368418955625 = 8236066^2 + 5689325^2 .

It is a cyclic number.

It is not a de Polignac number, because 100201202111981 - 2²² = 100201197917677 is a prime.

It is a super-2 number, since 2×100201202111981² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100201202111971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50100601055990 + 50100601055991.

It is an arithmetic number, because the mean of its divisors is an integer number (50100601055991).

Almost surely, 2^{100201202111981} is an apocalyptic number.

It is an amenable number.

100201202111981 is a deficient number, since it is larger than the sum of its proper divisors (1).

100201202111981 is an equidigital number, since it uses as much as digits as its factorization.

100201202111981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 29.

Adding to 100201202111981 its reverse (189111202102001), we get a palindrome (289312404213982).

The spelling of 100201202111981 in words is "one hundred trillion, two hundred one billion, two hundred two million, one hundred eleven thousand, nine hundred eighty-one".