21313220311333 has 2 divisors, whose sum is σ = 21313220311334. Its totient is φ = 21313220311332.

The previous prime is 21313220311247. The next prime is 21313220311343. The reversal of 21313220311333 is 33311302231312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17768728798209 + 3544491513124 = 4215297^2 + 1882682^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21313220311333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313220311343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656610155666 + 10656610155667.

It is an arithmetic number, because the mean of its divisors is an integer number (10656610155667).

Almost surely, 2^{21313220311333} is an apocalyptic number.

It is an amenable number.

21313220311333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313220311333 is an equidigital number, since it uses as much as digits as its factorization.

21313220311333 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 28.

Adding to 21313220311333 its reverse (33311302231312), we get a palindrome (54624522542645).

The spelling of 21313220311333 in words is "twenty-one trillion, three hundred thirteen billion, two hundred twenty million, three hundred eleven thousand, three hundred thirty-three".