210013121917 has 2 divisors, whose sum is σ = 210013121918. Its totient is φ = 210013121916.

The previous prime is 210013121863. The next prime is 210013122013. The reversal of 210013121917 is 719121310012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162533147716 + 47479974201 = 403154^2 + 217899^2 .

It is a cyclic number.

It is not a de Polignac number, because 210013121917 - 2²⁷ = 209878904189 is a prime.

It is a super-2 number, since 2×210013121917² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210013121117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105006560958 + 105006560959.

It is an arithmetic number, because the mean of its divisors is an integer number (105006560959).

Almost surely, 2^210013121917 is an apocalyptic number.

It is an amenable number.

210013121917 is a deficient number, since it is larger than the sum of its proper divisors (1).

210013121917 is an equidigital number, since it uses as much as digits as its factorization.

210013121917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 28.

Adding to 210013121917 its reverse (719121310012), we get a palindrome (929134431929).

The spelling of 210013121917 in words is "two hundred ten billion, thirteen million, one hundred twenty-one thousand, nine hundred seventeen".