520021331 has 2 divisors, whose sum is σ = 520021332. Its totient is φ = 520021330.

The previous prime is 520021321. The next prime is 520021343. The reversal of 520021331 is 133120025.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 520021331 - 2¹⁰ = 520020307 is a prime.

It is a super-2 number, since 2×520021331² = 540844369390023122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (520021321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260010665 + 260010666.

It is an arithmetic number, because the mean of its divisors is an integer number (260010666).

Almost surely, 2^520021331 is an apocalyptic number.

520021331 is a deficient number, since it is larger than the sum of its proper divisors (1).

520021331 is an equidigital number, since it uses as much as digits as its factorization.

520021331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 520021331 is about 22803.9762103016. The cubic root of 520021331 is about 804.1561472215.

Adding to 520021331 its reverse (133120025), we get a palindrome (653141356).

The spelling of 520021331 in words is "five hundred twenty million, twenty-one thousand, three hundred thirty-one".