121211111017 has 2 divisors, whose sum is σ = 121211111018. Its totient is φ = 121211111016.

The previous prime is 121211110903. The next prime is 121211111029. The reversal of 121211111017 is 710111112121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70828370496 + 50382740521 = 266136^2 + 224461^2 .

It is a cyclic number.

It is not a de Polignac number, because 121211111017 - 2³⁵ = 86851372649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121211110985 and 121211111003.

It is not a weakly prime, because it can be changed into another prime (121211111057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605555508 + 60605555509.

It is an arithmetic number, because the mean of its divisors is an integer number (60605555509).

Almost surely, 2^121211111017 is an apocalyptic number.

It is an amenable number.

121211111017 is a deficient number, since it is larger than the sum of its proper divisors (1).

121211111017 is an equidigital number, since it uses as much as digits as its factorization.

121211111017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 19.

Adding to 121211111017 its reverse (710111112121), we get a palindrome (831322223138).

The spelling of 121211111017 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, seventeen".