21403230203 has 2 divisors, whose sum is σ = 21403230204. Its totient is φ = 21403230202.

The previous prime is 21403230193. The next prime is 21403230229. The reversal of 21403230203 is 30203230412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21403230203 - 2⁴ = 21403230187 is a prime.

It is a super-2 number, since 2×21403230203² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21403230803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701615101 + 10701615102.

It is an arithmetic number, because the mean of its divisors is an integer number (10701615102).

Almost surely, 2^21403230203 is an apocalyptic number.

21403230203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21403230203 is an equidigital number, since it uses as much as digits as its factorization.

21403230203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21403230203 its reverse (30203230412), we get a palindrome (51606460615).

The spelling of 21403230203 in words is "twenty-one billion, four hundred three million, two hundred thirty thousand, two hundred three".