21103110317 has 2 divisors, whose sum is σ = 21103110318. Its totient is φ = 21103110316.

The previous prime is 21103110299. The next prime is 21103110373. The reversal of 21103110317 is 71301130112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20452146121 + 650964196 = 143011^2 + 25514^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103110317 - 2¹⁴ = 21103093933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21103110377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551555158 + 10551555159.

It is an arithmetic number, because the mean of its divisors is an integer number (10551555159).

Almost surely, 2^21103110317 is an apocalyptic number.

It is an amenable number.

21103110317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103110317 is an equidigital number, since it uses as much as digits as its factorization.

21103110317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 20.

Adding to 21103110317 its reverse (71301130112), we get a palindrome (92404240429).

The spelling of 21103110317 in words is "twenty-one billion, one hundred three million, one hundred ten thousand, three hundred seventeen".