21043030003 has 2 divisors, whose sum is σ = 21043030004. Its totient is φ = 21043030002.

The previous prime is 21043029991. The next prime is 21043030039. The reversal of 21043030003 is 30003034012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21043030003 - 2¹⁷ = 21042898931 is a prime.

It is a super-2 number, since 2×21043030003² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21043430003) 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, 10521515001 + 10521515002.

It is an arithmetic number, because the mean of its divisors is an integer number (10521515002).

Almost surely, 2^21043030003 is an apocalyptic number.

21043030003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21043030003 is an equidigital number, since it uses as much as digits as its factorization.

21043030003 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 16.

Adding to 21043030003 its reverse (30003034012), we get a palindrome (51046064015).

The spelling of 21043030003 in words is "twenty-one billion, forty-three million, thirty thousand, three".