210120021017 has 2 divisors, whose sum is σ = 210120021018. Its totient is φ = 210120021016.

The previous prime is 210120020963. The next prime is 210120021053. The reversal of 210120021017 is 710120021012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209577177616 + 542843401 = 457796^2 + 23299^2 .

It is a cyclic number.

It is not a de Polignac number, because 210120021017 - 2¹⁶ = 210119955481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210120020986 and 210120021004.

It is not a weakly prime, because it can be changed into another prime (210120029017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060010508 + 105060010509.

It is an arithmetic number, because the mean of its divisors is an integer number (105060010509).

Almost surely, 2^210120021017 is an apocalyptic number.

It is an amenable number.

210120021017 is a deficient number, since it is larger than the sum of its proper divisors (1).

210120021017 is an equidigital number, since it uses as much as digits as its factorization.

210120021017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 17.

Adding to 210120021017 its reverse (710120021012), we get a palindrome (920240042029).

The spelling of 210120021017 in words is "two hundred ten billion, one hundred twenty million, twenty-one thousand, seventeen".