520135021 has 8 divisors (see below), whose sum is σ = 601602624. Its totient is φ = 440458080.

The previous prime is 520134991. The next prime is 520135037. The reversal of 520135021 is 120531025.

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 520135021 - 2⁷ = 520134893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 520135021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520135321) 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 in 7 ways as a sum of consecutive naturals, for example, 447040 + ... + 448201.

It is an arithmetic number, because the mean of its divisors is an integer number (75200328).

Almost surely, 2^520135021 is an apocalyptic number.

It is an amenable number.

520135021 is a deficient number, since it is larger than the sum of its proper divisors (81467603).

520135021 is an equidigital number, since it uses as much as digits as its factorization.

520135021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895331.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 520135021 is about 22806.4688410986. The cubic root of 520135021 is about 804.2147460040.

Adding to 520135021 its reverse (120531025), we get a palindrome (640666046).

The spelling of 520135021 in words is "five hundred twenty million, one hundred thirty-five thousand, twenty-one".