130729021 has 2 divisors, whose sum is σ = 130729022. Its totient is φ = 130729020.

The previous prime is 130728991. The next prime is 130729037. The reversal of 130729021 is 120927031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78960996 + 51768025 = 8886^2 + 7195^2 .

It is a cyclic number.

It is not a de Polignac number, because 130729021 - 2⁹ = 130728509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (130729051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65364510 + 65364511.

It is an arithmetic number, because the mean of its divisors is an integer number (65364511).

Almost surely, 2^130729021 is an apocalyptic number.

It is an amenable number.

130729021 is a deficient number, since it is larger than the sum of its proper divisors (1).

130729021 is an equidigital number, since it uses as much as digits as its factorization.

130729021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 130729021 is about 11433.6792416090. The cubic root of 130729021 is about 507.5248789441.

The spelling of 130729021 in words is "one hundred thirty million, seven hundred twenty-nine thousand, twenty-one".