130520021 has 8 divisors (see below), whose sum is σ = 131667264. Its totient is φ = 129376800.

The previous prime is 130520017. The next prime is 130520029. The reversal of 130520021 is 120025031.

It is a happy number.

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

It is not a de Polignac number, because 130520021 - 2² = 130520017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 130519978 and 130520005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130520029) 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 7 ways as a sum of consecutive naturals, for example, 136481 + ... + 137433.

It is an arithmetic number, because the mean of its divisors is an integer number (16458408).

Almost surely, 2^130520021 is an apocalyptic number.

It is an amenable number.

130520021 is a deficient number, since it is larger than the sum of its proper divisors (1147243).

130520021 is an equidigital number, since it uses as much as digits as its factorization.

130520021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 130520021 is about 11424.5359205527. The cubic root of 130520021 is about 507.2542701273.

Adding to 130520021 its reverse (120025031), we get a palindrome (250545052).

The spelling of 130520021 in words is "one hundred thirty million, five hundred twenty thousand, twenty-one".