100636021 has 2 divisors, whose sum is σ = 100636022. Its totient is φ = 100636020.

The previous prime is 100635991. The next prime is 100636033. The reversal of 100636021 is 120636001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77968900 + 22667121 = 8830^2 + 4761^2 .

It is a cyclic number.

It is not a de Polignac number, because 100636021 - 2¹⁹ = 100111733 is a prime.

It is a super-4 number, since 4×100636021⁴ (a number of 33 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 100636021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100636621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50318010 + 50318011.

It is an arithmetic number, because the mean of its divisors is an integer number (50318011).

Almost surely, 2^100636021 is an apocalyptic number.

It is an amenable number.

100636021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100636021 is an equidigital number, since it uses as much as digits as its factorization.

100636021 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 19.

The square root of 100636021 is about 10031.7506448277. The cubic root of 100636021 is about 465.1408537722.

The spelling of 100636021 in words is "one hundred million, six hundred thirty-six thousand, twenty-one".