520021006431 has 16 divisors (see below), whose sum is σ = 696895750656. Its totient is φ = 344917903616.

The previous prime is 520021006403. The next prime is 520021006457. The reversal of 520021006431 is 134600120025.

It is a cyclic number.

It is not a de Polignac number, because 520021006431 - 2¹⁰ = 520021005407 is a prime.

It is a super-2 number, since 2×520021006431² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520021001431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85095 + ... + 1023368.

It is an arithmetic number, because the mean of its divisors is an integer number (43555984416).

Almost surely, 2^520021006431 is an apocalyptic number.

520021006431 is a deficient number, since it is larger than the sum of its proper divisors (176874744225).

520021006431 is a wasteful number, since it uses less digits than its factorization.

520021006431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109262.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 520021006431 its reverse (134600120025), we get a palindrome (654621126456).

The spelling of 520021006431 in words is "five hundred twenty billion, twenty-one million, six thousand, four hundred thirty-one".