21313631333 has 2 divisors, whose sum is σ = 21313631334. Its totient is φ = 21313631332.

The previous prime is 21313631291. The next prime is 21313631377. The reversal of 21313631333 is 33313631312.

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., 16708923169 + 4604708164 = 129263^2 + 67858^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313631333 - 2¹⁰ = 21313630309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21313631296 and 21313631305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313631033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656815666 + 10656815667.

It is an arithmetic number, because the mean of its divisors is an integer number (10656815667).

Almost surely, 2^21313631333 is an apocalyptic number.

It is an amenable number.

21313631333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313631333 is an equidigital number, since it uses as much as digits as its factorization.

21313631333 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 29.

The spelling of 21313631333 in words is "twenty-one billion, three hundred thirteen million, six hundred thirty-one thousand, three hundred thirty-three".