100231320311021 has 2 divisors, whose sum is σ = 100231320311022. Its totient is φ = 100231320311020.

The previous prime is 100231320310997. The next prime is 100231320311077. The reversal of 100231320311021 is 120113023132001.

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., 66134059321225 + 34097260989796 = 8132285^2 + 5839286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100231320311021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100231320310984 and 100231320311002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100231350311021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50115660155510 + 50115660155511.

It is an arithmetic number, because the mean of its divisors is an integer number (50115660155511).

Almost surely, 2^{100231320311021} is an apocalyptic number.

It is an amenable number.

100231320311021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100231320311021 is an equidigital number, since it uses as much as digits as its factorization.

100231320311021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 100231320311021 its reverse (120113023132001), we get a palindrome (220344343443022).

The spelling of 100231320311021 in words is "one hundred trillion, two hundred thirty-one billion, three hundred twenty million, three hundred eleven thousand, twenty-one".