21203000003 has 2 divisors, whose sum is σ = 21203000004. Its totient is φ = 21203000002.

The previous prime is 21202999969. The next prime is 21203000009. The reversal of 21203000003 is 30000030212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21203000003 - 2²² = 21198805699 is a prime.

It is not a weakly prime, because it can be changed into another prime (21203000009) 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, 10601500001 + 10601500002.

It is an arithmetic number, because the mean of its divisors is an integer number (10601500002).

Almost surely, 2^21203000003 is an apocalyptic number.

21203000003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203000003 is an equidigital number, since it uses as much as digits as its factorization.

21203000003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 11.

Adding to 21203000003 its reverse (30000030212), we get a palindrome (51203030215).

The spelling of 21203000003 in words is "twenty-one billion, two hundred three million, three", and thus it is an aban number.