21123311433317 has 2 divisors, whose sum is σ = 21123311433318. Its totient is φ = 21123311433316.

The previous prime is 21123311433293. The next prime is 21123311433349. The reversal of 21123311433317 is 71333411332112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14006762838721 + 7116548594596 = 3742561^2 + 2667686^2 .

It is a cyclic number.

It is not a de Polignac number, because 21123311433317 - 2⁶ = 21123311433253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21123311433017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561655716658 + 10561655716659.

It is an arithmetic number, because the mean of its divisors is an integer number (10561655716659).

Almost surely, 2^{21123311433317} is an apocalyptic number.

It is an amenable number.

21123311433317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21123311433317 is an equidigital number, since it uses as much as digits as its factorization.

21123311433317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 35.

Adding to 21123311433317 its reverse (71333411332112), we get a palindrome (92456722765429).

The spelling of 21123311433317 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred eleven million, four hundred thirty-three thousand, three hundred seventeen".