21221113424353 has 2 divisors, whose sum is σ = 21221113424354. Its totient is φ = 21221113424352.

The previous prime is 21221113424351. The next prime is 21221113424449. The reversal of 21221113424353 is 35342431112212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20999966135184 + 221147289169 = 4582572^2 + 470263^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221113424353 - 2¹ = 21221113424351 is a prime.

Together with 21221113424351, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21221113424351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610556712176 + 10610556712177.

It is an arithmetic number, because the mean of its divisors is an integer number (10610556712177).

Almost surely, 2^{21221113424353} is an apocalyptic number.

It is an amenable number.

21221113424353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221113424353 is an equidigital number, since it uses as much as digits as its factorization.

21221113424353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 34.

Adding to 21221113424353 its reverse (35342431112212), we get a palindrome (56563544536565).

The spelling of 21221113424353 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred thirteen million, four hundred twenty-four thousand, three hundred fifty-three".