130660021 has 4 divisors (see below), whose sum is σ = 130830700. Its totient is φ = 130489344.

The previous prime is 130660007. The next prime is 130660031. The reversal of 130660021 is 120066031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120066031 = 257 ⋅467183.

It can be written as a sum of positive squares in 2 ways, for example, as 27941796 + 102718225 = 5286^2 + 10135^2 .

It is a cyclic number.

It is not a de Polignac number, because 130660021 - 2⁹ = 130659509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130660001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84186 + ... + 85723.

It is an arithmetic number, because the mean of its divisors is an integer number (32707675).

Almost surely, 2^130660021 is an apocalyptic number.

It is an amenable number.

130660021 is a deficient number, since it is larger than the sum of its proper divisors (170679).

130660021 is an equidigital number, since it uses as much as digits as its factorization.

130660021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170678.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 130660021 is about 11430.6614419289. The cubic root of 130660021 is about 507.4355711037.

The spelling of 130660021 in words is "one hundred thirty million, six hundred sixty thousand, twenty-one".