21100323203 has 2 divisors, whose sum is σ = 21100323204. Its totient is φ = 21100323202.

The previous prime is 21100323173. The next prime is 21100323239. The reversal of 21100323203 is 30232300112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100323203 is a prime.

It is not a weakly prime, because it can be changed into another prime (21100323253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550161601 + 10550161602.

It is an arithmetic number, because the mean of its divisors is an integer number (10550161602).

Almost surely, 2^21100323203 is an apocalyptic number.

21100323203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100323203 is an equidigital number, since it uses as much as digits as its factorization.

21100323203 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 17.

Adding to 21100323203 its reverse (30232300112), we get a palindrome (51332623315).

The spelling of 21100323203 in words is "twenty-one billion, one hundred million, three hundred twenty-three thousand, two hundred three".