21331310333 has 2 divisors, whose sum is σ = 21331310334. Its totient is φ = 21331310332.

The previous prime is 21331310321. The next prime is 21331310339. The reversal of 21331310333 is 33301313312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15851313604 + 5479996729 = 125902^2 + 74027^2 .

It is a cyclic number.

It is not a de Polignac number, because 21331310333 - 2²⁴ = 21314533117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21331310299 and 21331310308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21331310339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665655166 + 10665655167.

It is an arithmetic number, because the mean of its divisors is an integer number (10665655167).

Almost surely, 2^21331310333 is an apocalyptic number.

It is an amenable number.

21331310333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331310333 is an equidigital number, since it uses as much as digits as its factorization.

21331310333 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 23.

Adding to 21331310333 its reverse (33301313312), we get a palindrome (54632623645).

The spelling of 21331310333 in words is "twenty-one billion, three hundred thirty-one million, three hundred ten thousand, three hundred thirty-three".