103212170021 has 2 divisors, whose sum is σ = 103212170022. Its totient is φ = 103212170020.

The previous prime is 103212170003. The next prime is 103212170051. The reversal of 103212170021 is 120071212301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63116512900 + 40095657121 = 251230^2 + 200239^2 .

It is an emirp because it is prime and its reverse (120071212301) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-103212170021 is a prime.

It is a super-2 number, since 2×103212170021² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 103212169975 and 103212170002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103212170051) 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, 51606085010 + 51606085011.

It is an arithmetic number, because the mean of its divisors is an integer number (51606085011).

Almost surely, 2^103212170021 is an apocalyptic number.

It is an amenable number.

103212170021 is a deficient number, since it is larger than the sum of its proper divisors (1).

103212170021 is an equidigital number, since it uses as much as digits as its factorization.

103212170021 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 103212170021 its reverse (120071212301), we get a palindrome (223283382322).

The spelling of 103212170021 in words is "one hundred three billion, two hundred twelve million, one hundred seventy thousand, twenty-one".