520341221 has 2 divisors, whose sum is σ = 520341222. Its totient is φ = 520341220.

The previous prime is 520341203. The next prime is 520341223. The reversal of 520341221 is 122143025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 395572321 + 124768900 = 19889^2 + 11170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520341221 is a prime.

Together with 520341223, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 520341193 and 520341202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520341223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260170610 + 260170611.

It is an arithmetic number, because the mean of its divisors is an integer number (260170611).

Almost surely, 2^520341221 is an apocalyptic number.

It is an amenable number.

520341221 is a deficient number, since it is larger than the sum of its proper divisors (1).

520341221 is an equidigital number, since it uses as much as digits as its factorization.

520341221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 520341221 is about 22810.9890403726. The cubic root of 520341221 is about 804.3210050619.

Adding to 520341221 its reverse (122143025), we get a palindrome (642484246).

The spelling of 520341221 in words is "five hundred twenty million, three hundred forty-one thousand, two hundred twenty-one".