20121120317 has 2 divisors, whose sum is σ = 20121120318. Its totient is φ = 20121120316.

The previous prime is 20121120301. The next prime is 20121120361. The reversal of 20121120317 is 71302112102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17843349241 + 2277771076 = 133579^2 + 47726^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121120317 - 2⁴ = 20121120301 is a prime.

It is a super-2 number, since 2×20121120317² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20121120377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060560158 + 10060560159.

It is an arithmetic number, because the mean of its divisors is an integer number (10060560159).

Almost surely, 2^20121120317 is an apocalyptic number.

It is an amenable number.

20121120317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121120317 is an equidigital number, since it uses as much as digits as its factorization.

20121120317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 20121120317 its reverse (71302112102), we get a palindrome (91423232419).

The spelling of 20121120317 in words is "twenty billion, one hundred twenty-one million, one hundred twenty thousand, three hundred seventeen".