130310021 has 8 divisors (see below), whose sum is σ = 135001080. Its totient is φ = 125632192.

The previous prime is 130310017. The next prime is 130310027. The reversal of 130310021 is 120013031.

It can be written as a sum of positive squares in 4 ways, for example, as 7344100 + 122965921 = 2710^2 + 11089^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 130310021 - 2² = 130310017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 130309984 and 130310011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130310027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19511 + ... + 25323.

It is an arithmetic number, because the mean of its divisors is an integer number (16875135).

Almost surely, 2^130310021 is an apocalyptic number.

It is an amenable number.

130310021 is a deficient number, since it is larger than the sum of its proper divisors (4691059).

130310021 is an equidigital number, since it uses as much as digits as its factorization.

130310021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6615.

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

The square root of 130310021 is about 11415.3414754005. The cubic root of 130310021 is about 506.9820754166.

Adding to 130310021 its reverse (120013031), we get a palindrome (250323052).

The spelling of 130310021 in words is "one hundred thirty million, three hundred ten thousand, twenty-one".