478210221 has 24 divisors (see below), whose sum is σ = 769878720. Its totient is φ = 284259456.

The previous prime is 478210217. The next prime is 478210223. The reversal of 478210221 is 122012874.

It is not a de Polignac number, because 478210221 - 2² = 478210217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478210223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79345 + ... + 85158.

It is an arithmetic number, because the mean of its divisors is an integer number (32078280).

Almost surely, 2^478210221 is an apocalyptic number.

It is an amenable number.

478210221 is a deficient number, since it is larger than the sum of its proper divisors (291668499).

478210221 is a wasteful number, since it uses less digits than its factorization.

478210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164545 (or 164542 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 478210221 is about 21868.0182229666. The cubic root of 478210221 is about 781.9991567506. Note that the first 3 decimals are identical.

The spelling of 478210221 in words is "four hundred seventy-eight million, two hundred ten thousand, two hundred twenty-one".