520000221 has 8 divisors (see below), whose sum is σ = 746667040. Its totient is φ = 320000112.

The previous prime is 520000193. The next prime is 520000223. The reversal of 520000221 is 122000025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 520000221 - 2¹³ = 519992029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520000197 and 520000206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520000223) 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, 6666631 + ... + 6666708.

It is an arithmetic number, because the mean of its divisors is an integer number (93333380).

Almost surely, 2^520000221 is an apocalyptic number.

It is an amenable number.

520000221 is a deficient number, since it is larger than the sum of its proper divisors (226666819).

520000221 is a wasteful number, since it uses less digits than its factorization.

520000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13333355.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 520000221 is about 22803.5133477278. The cubic root of 520000221 is about 804.1452656384.

Adding to 520000221 its reverse (122000025), we get a palindrome (642000246).

The spelling of 520000221 in words is "five hundred twenty million, two hundred twenty-one", and thus it is an aban number.