21100323320333 has 2 divisors, whose sum is σ = 21100323320334. Its totient is φ = 21100323320332.

The previous prime is 21100323320299. The next prime is 21100323320393. The reversal of 21100323320333 is 33302332300112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13546499830249 + 7553823490084 = 3680557^2 + 2748422^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100323320333 - 2¹⁸ = 21100323058189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100323320393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550161660166 + 10550161660167.

It is an arithmetic number, because the mean of its divisors is an integer number (10550161660167).

Almost surely, 2^{21100323320333} is an apocalyptic number.

It is an amenable number.

21100323320333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100323320333 is an equidigital number, since it uses as much as digits as its factorization.

21100323320333 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 26.

Adding to 21100323320333 its reverse (33302332300112), we get a palindrome (54402655620445).

The spelling of 21100323320333 in words is "twenty-one trillion, one hundred billion, three hundred twenty-three million, three hundred twenty thousand, three hundred thirty-three".