100001111111021 has 2 divisors, whose sum is σ = 100001111111022. Its totient is φ = 100001111111020.

The previous prime is 100001111111003. The next prime is 100001111111129. The reversal of 100001111111021 is 120111111100001.

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., 72884825382121 + 27116285728900 = 8537261^2 + 5207330^2 .

It is a cyclic number.

It is not a de Polignac number, because 100001111111021 - 2²⁶ = 100001044002157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100001111110993 and 100001111111011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100001111191021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000555555510 + 50000555555511.

It is an arithmetic number, because the mean of its divisors is an integer number (50000555555511).

Almost surely, 2^{100001111111021} is an apocalyptic number.

It is an amenable number.

100001111111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100001111111021 is an equidigital number, since it uses as much as digits as its factorization.

100001111111021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 100001111111021 its reverse (120111111100001), we get a palindrome (220112222211022).

The spelling of 100001111111021 in words is "one hundred trillion, one billion, one hundred eleven million, one hundred eleven thousand, twenty-one".