21424241422321 has 2 divisors, whose sum is σ = 21424241422322. Its totient is φ = 21424241422320.

The previous prime is 21424241422271. The next prime is 21424241422351. The reversal of 21424241422321 is 12322414242412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18798337847025 + 2625903575296 = 4335705^2 + 1620464^2 .

It is a cyclic number.

It is not a de Polignac number, because 21424241422321 - 2⁹ = 21424241421809 is a prime.

It is not a weakly prime, because it can be changed into another prime (21424241422351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712120711160 + 10712120711161.

It is an arithmetic number, because the mean of its divisors is an integer number (10712120711161).

Almost surely, 2^{21424241422321} is an apocalyptic number.

It is an amenable number.

21424241422321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21424241422321 is an equidigital number, since it uses as much as digits as its factorization.

21424241422321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49152, while the sum is 34.

Adding to 21424241422321 its reverse (12322414242412), we get a palindrome (33746655664733).

The spelling of 21424241422321 in words is "twenty-one trillion, four hundred twenty-four billion, two hundred forty-one million, four hundred twenty-two thousand, three hundred twenty-one".