21304410473 has 2 divisors, whose sum is σ = 21304410474. Its totient is φ = 21304410472.

The previous prime is 21304410467. The next prime is 21304410509. The reversal of 21304410473 is 37401440312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19351035664 + 1953374809 = 139108^2 + 44197^2 .

It is a cyclic number.

It is not a de Polignac number, because 21304410473 - 2¹⁰ = 21304409449 is a prime.

It is not a weakly prime, because it can be changed into another prime (21304410403) 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, 10652205236 + 10652205237.

It is an arithmetic number, because the mean of its divisors is an integer number (10652205237).

Almost surely, 2^21304410473 is an apocalyptic number.

It is an amenable number.

21304410473 is a deficient number, since it is larger than the sum of its proper divisors (1).

21304410473 is an equidigital number, since it uses as much as digits as its factorization.

21304410473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 29.

Adding to 21304410473 its reverse (37401440312), we get a palindrome (58705850785).

The spelling of 21304410473 in words is "twenty-one billion, three hundred four million, four hundred ten thousand, four hundred seventy-three".