100211311211981 has 2 divisors, whose sum is σ = 100211311211982. Its totient is φ = 100211311211980.

The previous prime is 100211311211971. The next prime is 100211311212029. The reversal of 100211311211981 is 189112113112001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98534091956356 + 1677219255625 = 9926434^2 + 1295075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100211311211981 is a prime.

It is a super-2 number, since 2×100211311211981² (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 (100211311211971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50105655605990 + 50105655605991.

It is an arithmetic number, because the mean of its divisors is an integer number (50105655605991).

Almost surely, 2^{100211311211981} is an apocalyptic number.

It is an amenable number.

100211311211981 is a deficient number, since it is larger than the sum of its proper divisors (1).

100211311211981 is an equidigital number, since it uses as much as digits as its factorization.

100211311211981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 32.

Adding to 100211311211981 its reverse (189112113112001), we get a palindrome (289323424323982).

The spelling of 100211311211981 in words is "one hundred trillion, two hundred eleven billion, three hundred eleven million, two hundred eleven thousand, nine hundred eighty-one".