520403344021 has 32 divisors (see below), whose sum is σ = 612631503360. Its totient is φ = 436768588800.

The previous prime is 520403344009. The next prime is 520403344033. The reversal of 520403344021 is 120443304025.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (520403344009) and next prime (520403344033).

It is not a de Polignac number, because 520403344021 - 2⁵ = 520403343989 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 (520403344061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4124215 + ... + 4248523.

It is an arithmetic number, because the mean of its divisors is an integer number (19144734480).

Almost surely, 2^520403344021 is an apocalyptic number.

It is an amenable number.

520403344021 is a deficient number, since it is larger than the sum of its proper divisors (92228159339).

520403344021 is a wasteful number, since it uses less digits than its factorization.

520403344021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124765.

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 520403344021 its reverse (120443304025), we get a palindrome (640846648046).

The spelling of 520403344021 in words is "five hundred twenty billion, four hundred three million, three hundred forty-four thousand, twenty-one".