103210120021 has 2 divisors, whose sum is σ = 103210120022. Its totient is φ = 103210120020.

The previous prime is 103210120019. The next prime is 103210120037. The reversal of 103210120021 is 120021012301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53072640625 + 50137479396 = 230375^2 + 223914^2 .

It is a cyclic number.

It is not a de Polignac number, because 103210120021 - 2¹ = 103210120019 is a prime.

Together with 103210120019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 103210119983 and 103210120010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103210124021) 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, 51605060010 + 51605060011.

It is an arithmetic number, because the mean of its divisors is an integer number (51605060011).

Almost surely, 2^103210120021 is an apocalyptic number.

It is an amenable number.

103210120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

103210120021 is an equidigital number, since it uses as much as digits as its factorization.

103210120021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 103210120021 its reverse (120021012301), we get a palindrome (223231132322).

The spelling of 103210120021 in words is "one hundred three billion, two hundred ten million, one hundred twenty thousand, twenty-one".