210121010017 has 2 divisors, whose sum is σ = 210121010018. Its totient is φ = 210121010016.

The previous prime is 210121009951. The next prime is 210121010023. The reversal of 210121010017 is 710010121012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194325798976 + 15795211041 = 440824^2 + 125679^2 .

It is a cyclic number.

It is not a de Polignac number, because 210121010017 - 2²⁷ = 209986792289 is a prime.

It is not a weakly prime, because it can be changed into another prime (210121010417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060505008 + 105060505009.

It is an arithmetic number, because the mean of its divisors is an integer number (105060505009).

Almost surely, 2^210121010017 is an apocalyptic number.

It is an amenable number.

210121010017 is a deficient number, since it is larger than the sum of its proper divisors (1).

210121010017 is an equidigital number, since it uses as much as digits as its factorization.

210121010017 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 16.

Adding to 210121010017 its reverse (710010121012), we get a palindrome (920131131029).

The spelling of 210121010017 in words is "two hundred ten billion, one hundred twenty-one million, ten thousand, seventeen".