21313332221273 has 2 divisors, whose sum is σ = 21313332221274. Its totient is φ = 21313332221272.

The previous prime is 21313332221267. The next prime is 21313332221327. The reversal of 21313332221273 is 37212223331312.

Together with next prime (21313332221327) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17115455748889 + 4197876472384 = 4137083^2 + 2048872^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313332221273 - 2⁴⁰ = 20213820593497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21313332221473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656666110636 + 10656666110637.

It is an arithmetic number, because the mean of its divisors is an integer number (10656666110637).

Almost surely, 2^{21313332221273} is an apocalyptic number.

It is an amenable number.

21313332221273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313332221273 is an equidigital number, since it uses as much as digits as its factorization.

21313332221273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 35.

Adding to 21313332221273 its reverse (37212223331312), we get a palindrome (58525555552585).

The spelling of 21313332221273 in words is "twenty-one trillion, three hundred thirteen billion, three hundred thirty-two million, two hundred twenty-one thousand, two hundred seventy-three".