21011322111317 has 2 divisors, whose sum is σ = 21011322111318. Its totient is φ = 21011322111316.

The previous prime is 21011322111293. The next prime is 21011322111341. The reversal of 21011322111317 is 71311122311012.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (21011322111293) and next prime (21011322111341).

It can be written as a sum of positive squares in only one way, i.e., 19631199965521 + 1380122145796 = 4430711^2 + 1174786^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011322111317 - 2¹² = 21011322107221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011322114317) 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, 10505661055658 + 10505661055659.

It is an arithmetic number, because the mean of its divisors is an integer number (10505661055659).

Almost surely, 2^{21011322111317} is an apocalyptic number.

It is an amenable number.

21011322111317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011322111317 is an equidigital number, since it uses as much as digits as its factorization.

21011322111317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 26.

Adding to 21011322111317 its reverse (71311122311012), we get a palindrome (92322444422329).

The spelling of 21011322111317 in words is "twenty-one trillion, eleven billion, three hundred twenty-two million, one hundred eleven thousand, three hundred seventeen".