21304103273 has 2 divisors, whose sum is σ = 21304103274. Its totient is φ = 21304103272.

The previous prime is 21304103239. The next prime is 21304103287. The reversal of 21304103273 is 37230140312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20451288064 + 852815209 = 143008^2 + 29203^2 .

It is a cyclic number.

It is not a de Polignac number, because 21304103273 - 2⁶ = 21304103209 is a prime.

It is not a weakly prime, because it can be changed into another prime (21304103473) 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, 10652051636 + 10652051637.

It is an arithmetic number, because the mean of its divisors is an integer number (10652051637).

Almost surely, 2^21304103273 is an apocalyptic number.

It is an amenable number.

21304103273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21304103273 is an equidigital number, since it uses as much as digits as its factorization.

21304103273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 26.

Adding to 21304103273 its reverse (37230140312), we get a palindrome (58534243585).

The spelling of 21304103273 in words is "twenty-one billion, three hundred four million, one hundred three thousand, two hundred seventy-three".