121021020317 has 2 divisors, whose sum is σ = 121021020318. Its totient is φ = 121021020316.

The previous prime is 121021020229. The next prime is 121021020377. The reversal of 121021020317 is 713020120121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111296299321 + 9724720996 = 333611^2 + 98614^2 .

It is a cyclic number.

It is not a de Polignac number, because 121021020317 - 2¹⁴ = 121021003933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121021020377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510510158 + 60510510159.

It is an arithmetic number, because the mean of its divisors is an integer number (60510510159).

Almost surely, 2^121021020317 is an apocalyptic number.

It is an amenable number.

121021020317 is a deficient number, since it is larger than the sum of its proper divisors (1).

121021020317 is an equidigital number, since it uses as much as digits as its factorization.

121021020317 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 121021020317 its reverse (713020120121), we get a palindrome (834041140438).

The spelling of 121021020317 in words is "one hundred twenty-one billion, twenty-one million, twenty thousand, three hundred seventeen".