100011031231021 has 2 divisors, whose sum is σ = 100011031231022. Its totient is φ = 100011031231020.

The previous prime is 100011031230961. The next prime is 100011031231037. The reversal of 100011031231021 is 120132130110001.

It is a happy number.

It is an a-pointer prime, because the next prime (100011031231037) can be obtained adding 100011031231021 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89781044781796 + 10229986449225 = 9475286^2 + 3198435^2 .

It is an emirp because it is prime and its reverse (120132130110001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100011031231021 - 2²³ = 100011022842413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100011031230986 and 100011031231004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100011031231421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50005515615510 + 50005515615511.

It is an arithmetic number, because the mean of its divisors is an integer number (50005515615511).

Almost surely, 2^{100011031231021} is an apocalyptic number.

It is an amenable number.

100011031231021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100011031231021 is an equidigital number, since it uses as much as digits as its factorization.

100011031231021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 100011031231021 its reverse (120132130110001), we get a palindrome (220143161341022).

The spelling of 100011031231021 in words is "one hundred trillion, eleven billion, thirty-one million, two hundred thirty-one thousand, twenty-one".