100017860021 has 2 divisors, whose sum is σ = 100017860022. Its totient is φ = 100017860020.

The previous prime is 100017859999. The next prime is 100017860071. The reversal of 100017860021 is 120068710001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57288422500 + 42729437521 = 239350^2 + 206711^2 .

It is an emirp because it is prime and its reverse (120068710001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100017860021 - 2⁶ = 100017859957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100017860071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50008930010 + 50008930011.

It is an arithmetic number, because the mean of its divisors is an integer number (50008930011).

Almost surely, 2^100017860021 is an apocalyptic number.

It is an amenable number.

100017860021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100017860021 is an equidigital number, since it uses as much as digits as its factorization.

100017860021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 26.

The spelling of 100017860021 in words is "one hundred billion, seventeen million, eight hundred sixty thousand, twenty-one".