500013221 has 2 divisors, whose sum is σ = 500013222. Its totient is φ = 500013220.

The previous prime is 500013211. The next prime is 500013223. The reversal of 500013221 is 122310005.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 479128321 + 20884900 = 21889^2 + 4570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-500013221 is a prime.

Together with 500013223, 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 = 500013196 and 500013205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (500013223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250006610 + 250006611.

It is an arithmetic number, because the mean of its divisors is an integer number (250006611).

Almost surely, 2^500013221 is an apocalyptic number.

It is an amenable number.

500013221 is a deficient number, since it is larger than the sum of its proper divisors (1).

500013221 is an equidigital number, since it uses as much as digits as its factorization.

500013221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 500013221 is about 22360.9754035910. The cubic root of 500013221 is about 793.7075215989.

Adding to 500013221 its reverse (122310005), we get a palindrome (622323226).

The spelling of 500013221 in words is "five hundred million, thirteen thousand, two hundred twenty-one".