500418221 has 2 divisors, whose sum is σ = 500418222. Its totient is φ = 500418220.

The previous prime is 500418211. The next prime is 500418223. The reversal of 500418221 is 122814005.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 363855625 + 136562596 = 19075^2 + 11686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-500418221 is a prime.

Together with 500418223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (500418223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250209110 + 250209111.

It is an arithmetic number, because the mean of its divisors is an integer number (250209111).

Almost surely, 2^500418221 is an apocalyptic number.

It is an amenable number.

500418221 is a deficient number, since it is larger than the sum of its proper divisors (1).

500418221 is an equidigital number, since it uses as much as digits as its factorization.

500418221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 500418221 is about 22370.0295261316. The cubic root of 500418221 is about 793.9217591311.

The spelling of 500418221 in words is "five hundred million, four hundred eighteen thousand, two hundred twenty-one".