121220017 has 2 divisors, whose sum is σ = 121220018. Its totient is φ = 121220016.

The previous prime is 121219999. The next prime is 121220023. The reversal of 121220017 is 710022121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112699456 + 8520561 = 10616^2 + 2919^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220017 - 2²³ = 112831409 is a prime.

It is not a weakly prime, because it can be changed into another prime (121220117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610008 + 60610009.

It is an arithmetic number, because the mean of its divisors is an integer number (60610009).

Almost surely, 2^121220017 is an apocalyptic number.

It is an amenable number.

121220017 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220017 is an equidigital number, since it uses as much as digits as its factorization.

121220017 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 16.

The square root of 121220017 is about 11009.9962306987. The cubic root of 121220017 is about 494.9083488445.

Adding to 121220017 its reverse (710022121), we get a palindrome (831242138).

The spelling of 121220017 in words is "one hundred twenty-one million, two hundred twenty thousand, seventeen".