221351008 has 24 divisors (see below), whose sum is σ = 443174760. Its totient is φ = 108798720.

The previous prime is 221350981. The next prime is 221351021. The reversal of 221351008 is 800153122.

It is a self number, because there is not a number n which added to its sum of digits gives 221351008.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56733 + ... + 60508.

It is an arithmetic number, because the mean of its divisors is an integer number (18465615).

Almost surely, 2^221351008 is an apocalyptic number.

It is an amenable number.

221351008 is an abundant number, since it is smaller than the sum of its proper divisors (221823752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221351008 is a wasteful number, since it uses less digits than its factorization.

221351008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117310 (or 117302 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 221351008 is about 14877.8697399863. The cubic root of 221351008 is about 604.9142769512.

The spelling of 221351008 in words is "two hundred twenty-one million, three hundred fifty-one thousand, eight".