21100223203 has 2 divisors, whose sum is σ = 21100223204. Its totient is φ = 21100223202.

The previous prime is 21100223173. The next prime is 21100223219. The reversal of 21100223203 is 30232200112.

It is an a-pointer prime, because the next prime (21100223219) can be obtained adding 21100223203 to its sum of digits (16).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100223203 - 2⁵ = 21100223171 is a prime.

It is not a weakly prime, because it can be changed into another prime (21100223233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550111601 + 10550111602.

It is an arithmetic number, because the mean of its divisors is an integer number (10550111602).

Almost surely, 2^21100223203 is an apocalyptic number.

21100223203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100223203 is an equidigital number, since it uses as much as digits as its factorization.

21100223203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21100223203 its reverse (30232200112), we get a palindrome (51332423315).

The spelling of 21100223203 in words is "twenty-one billion, one hundred million, two hundred twenty-three thousand, two hundred three".