20121212120017 has 2 divisors, whose sum is σ = 20121212120018. Its totient is φ = 20121212120016.

The previous prime is 20121212119993. The next prime is 20121212120027. The reversal of 20121212120017 is 71002121212102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19170526669056 + 950685450961 = 4378416^2 + 975031^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121212120017 - 2⁷ = 20121212119889 is a prime.

It is a super-2 number, since 2×20121212120017² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20121212120017.

It is not a weakly prime, because it can be changed into another prime (20121212120027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060606060008 + 10060606060009.

It is an arithmetic number, because the mean of its divisors is an integer number (10060606060009).

Almost surely, 2^{20121212120017} is an apocalyptic number.

It is an amenable number.

20121212120017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121212120017 is an equidigital number, since it uses as much as digits as its factorization.

20121212120017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 20121212120017 its reverse (71002121212102), we get a palindrome (91123333332119).

The spelling of 20121212120017 in words is "twenty trillion, one hundred twenty-one billion, two hundred twelve million, one hundred twenty thousand, seventeen".