100012109999981 has 2 divisors, whose sum is σ = 100012109999982. Its totient is φ = 100012109999980.

The previous prime is 100012109999951. The next prime is 100012110000071. The reversal of 100012109999981 is 189999901210001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96925324544356 + 3086785455625 = 9845066^2 + 1756925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100012109999981 is a prime.

It is a super-2 number, since 2×100012109999981² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 100012109999981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100012109999941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50006054999990 + 50006054999991.

It is an arithmetic number, because the mean of its divisors is an integer number (50006054999991).

Almost surely, 2^{100012109999981} is an apocalyptic number.

It is an amenable number.

100012109999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

100012109999981 is an equidigital number, since it uses as much as digits as its factorization.

100012109999981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 944784, while the sum is 59.

The spelling of 100012109999981 in words is "one hundred trillion, twelve billion, one hundred nine million, nine hundred ninety-nine thousand, nine hundred eighty-one".