221889220 has 48 divisors (see below), whose sum is σ = 560568960. Its totient is φ = 72071424.

The previous prime is 221889197. The next prime is 221889221. The reversal of 221889220 is 22988122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221889221) 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 15 ways as a sum of consecutive naturals, for example, 39049 + ... + 44368.

It is an arithmetic number, because the mean of its divisors is an integer number (11678520).

Almost surely, 2^221889220 is an apocalyptic number.

221889220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221889220 is an abundant number, since it is smaller than the sum of its proper divisors (338679740).

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

221889220 is a wasteful number, since it uses less digits than its factorization.

221889220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83452 (or 83450 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 221889220 is about 14895.9464284751. The cubic root of 221889220 is about 605.4041604277.

The spelling of 221889220 in words is "two hundred twenty-one million, eight hundred eighty-nine thousand, two hundred twenty".