21301321333 has 2 divisors, whose sum is σ = 21301321334. Its totient is φ = 21301321332.

The previous prime is 21301321331. The next prime is 21301321427. The reversal of 21301321333 is 33312310312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11031931089 + 10269390244 = 105033^2 + 101338^2 .

It is a cyclic number.

It is not a de Polignac number, because 21301321333 - 2¹ = 21301321331 is a prime.

Together with 21301321331, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21301321331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650660666 + 10650660667.

It is an arithmetic number, because the mean of its divisors is an integer number (10650660667).

Almost surely, 2^21301321333 is an apocalyptic number.

It is an amenable number.

21301321333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301321333 is an equidigital number, since it uses as much as digits as its factorization.

21301321333 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21301321333 its reverse (33312310312), we get a palindrome (54613631645).

The spelling of 21301321333 in words is "twenty-one billion, three hundred one million, three hundred twenty-one thousand, three hundred thirty-three".