21304333340273 has 2 divisors, whose sum is σ = 21304333340274. Its totient is φ = 21304333340272.

The previous prime is 21304333340249. The next prime is 21304333340363. The reversal of 21304333340273 is 37204333340312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16991683677409 + 4312649662864 = 4122097^2 + 2076692^2 .

It is a cyclic number.

It is not a de Polignac number, because 21304333340273 - 2¹⁰ = 21304333339249 is a prime.

It is not a weakly prime, because it can be changed into another prime (21304333340203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10652166670136 + 10652166670137.

It is an arithmetic number, because the mean of its divisors is an integer number (10652166670137).

Almost surely, 2^{21304333340273} is an apocalyptic number.

It is an amenable number.

21304333340273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21304333340273 is an equidigital number, since it uses as much as digits as its factorization.

21304333340273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 38.

Adding to 21304333340273 its reverse (37204333340312), we get a palindrome (58508666680585).

The spelling of 21304333340273 in words is "twenty-one trillion, three hundred four billion, three hundred thirty-three million, three hundred forty thousand, two hundred seventy-three".