499670221 has 2 divisors, whose sum is σ = 499670222. Its totient is φ = 499670220.

The previous prime is 499670219. The next prime is 499670243. The reversal of 499670221 is 122076994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 497914596 + 1755625 = 22314^2 + 1325^2 .

It is a cyclic number.

It is not a de Polignac number, because 499670221 - 2¹ = 499670219 is a prime.

Together with 499670219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (499670251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249835110 + 249835111.

It is an arithmetic number, because the mean of its divisors is an integer number (249835111).

Almost surely, 2^499670221 is an apocalyptic number.

It is an amenable number.

499670221 is a deficient number, since it is larger than the sum of its proper divisors (1).

499670221 is an equidigital number, since it uses as much as digits as its factorization.

499670221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 499670221 is about 22353.3044760724. The cubic root of 499670221 is about 793.5259904292.

The spelling of 499670221 in words is "four hundred ninety-nine million, six hundred seventy thousand, two hundred twenty-one".