520221011 has 4 divisors (see below), whose sum is σ = 520291800. Its totient is φ = 520150224.

The previous prime is 520220989. The next prime is 520221019. The reversal of 520221011 is 110122025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520221011 - 2¹⁸ = 519958867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520221019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22901 + ... + 39558.

It is an arithmetic number, because the mean of its divisors is an integer number (130072950).

Almost surely, 2^520221011 is an apocalyptic number.

520221011 is a deficient number, since it is larger than the sum of its proper divisors (70789).

520221011 is an equidigital number, since it uses as much as digits as its factorization.

520221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70788.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 520221011 is about 22808.3539739281. The cubic root of 520221011 is about 804.2590618147.

Adding to 520221011 its reverse (110122025), we get a palindrome (630343036).

The spelling of 520221011 in words is "five hundred twenty million, two hundred twenty-one thousand, eleven".