100191821603 has 2 divisors, whose sum is σ = 100191821604. Its totient is φ = 100191821602.

The previous prime is 100191821599. The next prime is 100191821731. The reversal of 100191821603 is 306128191001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100191821603 - 2² = 100191821599 is a prime.

It is a super-2 number, since 2×100191821603² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 100191821603.

It is not a weakly prime, because it can be changed into another prime (100191821203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50095910801 + 50095910802.

It is an arithmetic number, because the mean of its divisors is an integer number (50095910802).

Almost surely, 2^100191821603 is an apocalyptic number.

100191821603 is a deficient number, since it is larger than the sum of its proper divisors (1).

100191821603 is an equidigital number, since it uses as much as digits as its factorization.

100191821603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The spelling of 100191821603 in words is "one hundred billion, one hundred ninety-one million, eight hundred twenty-one thousand, six hundred three".