221800908 has 96 divisors (see below), whose sum is σ = 642826240. Its totient is φ = 58086720.

The previous prime is 221800907. The next prime is 221800913. The reversal of 221800908 is 809008122.

221800908 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221800907) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47235 + ... + 51717.

Almost surely, 2^221800908 is an apocalyptic number.

221800908 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221800908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321413120).

221800908 is an abundant number, since it is smaller than the sum of its proper divisors (421025332).

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

221800908 is a wasteful number, since it uses less digits than its factorization.

221800908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4547 (or 4545 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 221800908 is about 14892.9818370936. The cubic root of 221800908 is about 605.3238327357.

The spelling of 221800908 in words is "two hundred twenty-one million, eight hundred thousand, nine hundred eight".