21131030203 has 2 divisors, whose sum is σ = 21131030204. Its totient is φ = 21131030202.

The previous prime is 21131030183. The next prime is 21131030231. The reversal of 21131030203 is 30203013112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21131030203 - 2¹⁷ = 21130899131 is a prime.

It is not a weakly prime, because it can be changed into another prime (21131030273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565515101 + 10565515102.

It is an arithmetic number, because the mean of its divisors is an integer number (10565515102).

Almost surely, 2^21131030203 is an apocalyptic number.

21131030203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131030203 is an equidigital number, since it uses as much as digits as its factorization.

21131030203 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 21131030203 its reverse (30203013112), we get a palindrome (51334043315).

The spelling of 21131030203 in words is "twenty-one billion, one hundred thirty-one million, thirty thousand, two hundred three".