21110030317 has 2 divisors, whose sum is σ = 21110030318. Its totient is φ = 21110030316.

The previous prime is 21110030309. The next prime is 21110030369. The reversal of 21110030317 is 71303001112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15699839401 + 5410190916 = 125299^2 + 73554^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110030317 - 2³ = 21110030309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21110030294 and 21110030303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110030717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555015158 + 10555015159.

It is an arithmetic number, because the mean of its divisors is an integer number (10555015159).

Almost surely, 2^21110030317 is an apocalyptic number.

It is an amenable number.

21110030317 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110030317 is an equidigital number, since it uses as much as digits as its factorization.

21110030317 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 19.

Adding to 21110030317 its reverse (71303001112), we get a palindrome (92413031429).

The spelling of 21110030317 in words is "twenty-one billion, one hundred ten million, thirty thousand, three hundred seventeen".