21043224062321 has 2 divisors, whose sum is σ = 21043224062322. Its totient is φ = 21043224062320.

The previous prime is 21043224062303. The next prime is 21043224062323. The reversal of 21043224062321 is 12326042234012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12581315410225 + 8461908652096 = 3547015^2 + 2908936^2 .

It is a cyclic number.

It is not a de Polignac number, because 21043224062321 - 2¹⁰ = 21043224061297 is a prime.

Together with 21043224062323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21043224062323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521612031160 + 10521612031161.

It is an arithmetic number, because the mean of its divisors is an integer number (10521612031161).

Almost surely, 2^{21043224062321} is an apocalyptic number.

It is an amenable number.

21043224062321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21043224062321 is an equidigital number, since it uses as much as digits as its factorization.

21043224062321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21043224062321 its reverse (12326042234012), we get a palindrome (33369266296333).

The spelling of 21043224062321 in words is "twenty-one trillion, forty-three billion, two hundred twenty-four million, sixty-two thousand, three hundred twenty-one".