21221113424333 has 2 divisors, whose sum is σ = 21221113424334. Its totient is φ = 21221113424332.

The previous prime is 21221113424249. The next prime is 21221113424351. The reversal of 21221113424333 is 33342431112212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20596321192489 + 624792231844 = 4538317^2 + 790438^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221113424333 - 2¹⁸ = 21221113162189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221113424333.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221113424353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610556712166 + 10610556712167.

It is an arithmetic number, because the mean of its divisors is an integer number (10610556712167).

Almost surely, 2^{21221113424333} is an apocalyptic number.

It is an amenable number.

21221113424333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221113424333 is an equidigital number, since it uses as much as digits as its factorization.

21221113424333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 32.

Adding to 21221113424333 its reverse (33342431112212), we get a palindrome (54563544536545).

The spelling of 21221113424333 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred thirteen million, four hundred twenty-four thousand, three hundred thirty-three".