103130021 has 2 divisors, whose sum is σ = 103130022. Its totient is φ = 103130020.

The previous prime is 103129993. The next prime is 103130029. The reversal of 103130021 is 120031301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75933796 + 27196225 = 8714^2 + 5215^2 .

It is a cyclic number.

It is not a de Polignac number, because 103130021 - 2¹⁰ = 103128997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 103129984 and 103130011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103130029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51565010 + 51565011.

It is an arithmetic number, because the mean of its divisors is an integer number (51565011).

Almost surely, 2^103130021 is an apocalyptic number.

It is an amenable number.

103130021 is a deficient number, since it is larger than the sum of its proper divisors (1).

103130021 is an equidigital number, since it uses as much as digits as its factorization.

103130021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 103130021 is about 10155.2952197364. The cubic root of 103130021 is about 468.9519744484.

Adding to 103130021 its reverse (120031301), we get a palindrome (223161322).

The spelling of 103130021 in words is "one hundred three million, one hundred thirty thousand, twenty-one".