21242304203 has 2 divisors, whose sum is σ = 21242304204. Its totient is φ = 21242304202.

The previous prime is 21242304197. The next prime is 21242304227. The reversal of 21242304203 is 30240324212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21242304203 is a prime.

It is not a weakly prime, because it can be changed into another prime (21242304103) 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, 10621152101 + 10621152102.

It is an arithmetic number, because the mean of its divisors is an integer number (10621152102).

Almost surely, 2^21242304203 is an apocalyptic number.

21242304203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21242304203 is an equidigital number, since it uses as much as digits as its factorization.

21242304203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21242304203 its reverse (30240324212), we get a palindrome (51482628415).

The spelling of 21242304203 in words is "twenty-one billion, two hundred forty-two million, three hundred four thousand, two hundred three".