520321440421 has 8 divisors (see below), whose sum is σ = 539113249944. Its totient is φ = 501778529280.

The previous prime is 520321440409. The next prime is 520321440427. The reversal of 520321440421 is 124044123025.

It can be written as a sum of positive squares in 4 ways, for example, as 95496450625 + 424824989796 = 309025^2 + 651786^2 .

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 520321440421 - 2⁵ = 520321440389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520321440421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520321440427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62220340 + ... + 62228701.

It is an arithmetic number, because the mean of its divisors is an integer number (67389156243).

Almost surely, 2^520321440421 is an apocalyptic number.

It is an amenable number.

520321440421 is a deficient number, since it is larger than the sum of its proper divisors (18791809523).

520321440421 is a wasteful number, since it uses less digits than its factorization.

520321440421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124449191.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 520321440421 its reverse (124044123025), we get a palindrome (644365563446).

The spelling of 520321440421 in words is "five hundred twenty billion, three hundred twenty-one million, four hundred forty thousand, four hundred twenty-one".