121212017 has 2 divisors, whose sum is σ = 121212018. Its totient is φ = 121212016.

The previous prime is 121211999. The next prime is 121212071. The reversal of 121212017 is 710212121.

Together with next prime (121212071) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97436641 + 23775376 = 9871^2 + 4876^2 .

It is an emirp because it is prime and its reverse (710212121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121212017 - 2²⁰ = 120163441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121211986 and 121212004.

It is not a weakly prime, because it can be changed into another prime (121212097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60606008 + 60606009.

It is an arithmetic number, because the mean of its divisors is an integer number (60606009).

Almost surely, 2^121212017 is an apocalyptic number.

It is an amenable number.

121212017 is a deficient number, since it is larger than the sum of its proper divisors (1).

121212017 is an equidigital number, since it uses as much as digits as its factorization.

121212017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 121212017 is about 11009.6329184946. The cubic root of 121212017 is about 494.8974613305.

Adding to 121212017 its reverse (710212121), we get a palindrome (831424138).

The spelling of 121212017 in words is "one hundred twenty-one million, two hundred twelve thousand, seventeen".