520611115340021 has 8 divisors (see below), whose sum is σ = 523530341423544. Its totient is φ = 517692360922560.

The previous prime is 520611115339963. The next prime is 520611115340023. The reversal of 520611115340021 is 120043511116025.

It can be written as a sum of positive squares in 4 ways, for example, as 1946474215921 + 518664641124100 = 1395161^2 + 22774210^2 .

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 520611115340021 - 2¹⁰ = 520611115338997 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 520611115340021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520611115340023) 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, 115702670 + ... + 120117983.

It is an arithmetic number, because the mean of its divisors is an integer number (65441292677943).

Almost surely, 2^{520611115340021} is an apocalyptic number.

It is an amenable number.

520611115340021 is a deficient number, since it is larger than the sum of its proper divisors (2919226083523).

520611115340021 is a wasteful number, since it uses less digits than its factorization.

520611115340021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235833031.

The product of its (nonzero) digits is 7200, while the sum is 32.

Adding to 520611115340021 its reverse (120043511116025), we get a palindrome (640654626456046).

The spelling of 520611115340021 in words is "five hundred twenty trillion, six hundred eleven billion, one hundred fifteen million, three hundred forty thousand, twenty-one".