210121121017 has 2 divisors, whose sum is σ = 210121121018. Its totient is φ = 210121121016.

The previous prime is 210121120967. The next prime is 210121121051. The reversal of 210121121017 is 710121121012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156138780736 + 53982340281 = 395144^2 + 232341^2 .

It is a cyclic number.

It is not a de Polignac number, because 210121121017 - 2²³ = 210112732409 is a prime.

It is a super-2 number, since 2×210121121017² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 210121120985 and 210121121003.

It is not a weakly prime, because it can be changed into another prime (210121121117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060560508 + 105060560509.

It is an arithmetic number, because the mean of its divisors is an integer number (105060560509).

Almost surely, 2^210121121017 is an apocalyptic number.

It is an amenable number.

210121121017 is a deficient number, since it is larger than the sum of its proper divisors (1).

210121121017 is an equidigital number, since it uses as much as digits as its factorization.

210121121017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 210121121017 its reverse (710121121012), we get a palindrome (920242242029).

The spelling of 210121121017 in words is "two hundred ten billion, one hundred twenty-one million, one hundred twenty-one thousand, seventeen".