21203113003 has 2 divisors, whose sum is σ = 21203113004. Its totient is φ = 21203113002.

The previous prime is 21203112989. The next prime is 21203113007. The reversal of 21203113003 is 30031130212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21203113003 - 2¹⁷ = 21202981931 is a prime.

It is not a weakly prime, because it can be changed into another prime (21203113007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601556501 + 10601556502.

It is an arithmetic number, because the mean of its divisors is an integer number (10601556502).

Almost surely, 2^21203113003 is an apocalyptic number.

21203113003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203113003 is an equidigital number, since it uses as much as digits as its factorization.

21203113003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21203113003 its reverse (30031130212), we get a palindrome (51234243215).

The spelling of 21203113003 in words is "twenty-one billion, two hundred three million, one hundred thirteen thousand, three".