221306808 has 64 divisors (see below), whose sum is σ = 564710400. Its totient is φ = 72259200.

The previous prime is 221306803. The next prime is 221306809. The reversal of 221306808 is 808603122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221306803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 285910 + ... + 286682.

It is an arithmetic number, because the mean of its divisors is an integer number (8823600).

Almost surely, 2^221306808 is an apocalyptic number.

It is an amenable number.

221306808 is an abundant number, since it is smaller than the sum of its proper divisors (343403592).

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

221306808 is a wasteful number, since it uses less digits than its factorization.

221306808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012 (or 1008 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 221306808 is about 14876.3842381138. The cubic root of 221306808 is about 604.8740106021.

The spelling of 221306808 in words is "two hundred twenty-one million, three hundred six thousand, eight hundred eight".