21344131273 has 2 divisors, whose sum is σ = 21344131274. Its totient is φ = 21344131272.

The previous prime is 21344131201. The next prime is 21344131279. The reversal of 21344131273 is 37213144312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20285735184 + 1058396089 = 142428^2 + 32533^2 .

It is a cyclic number.

It is not a de Polignac number, because 21344131273 - 2¹⁷ = 21344000201 is a prime.

It is not a weakly prime, because it can be changed into another prime (21344131279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672065636 + 10672065637.

It is an arithmetic number, because the mean of its divisors is an integer number (10672065637).

Almost surely, 2^21344131273 is an apocalyptic number.

It is an amenable number.

21344131273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344131273 is an equidigital number, since it uses as much as digits as its factorization.

21344131273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 31.

Adding to 21344131273 its reverse (37213144312), we get a palindrome (58557275585).

The spelling of 21344131273 in words is "twenty-one billion, three hundred forty-four million, one hundred thirty-one thousand, two hundred seventy-three".