221798484 has 36 divisors (see below), whose sum is σ = 561191904. Its totient is φ = 73862352.

The previous prime is 221798483. The next prime is 221798491. The reversal of 221798484 is 484897122.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221798483) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 46959 + ... + 51465.

It is an arithmetic number, because the mean of its divisors is an integer number (15588664).

Almost surely, 2^221798484 is an apocalyptic number.

It is an amenable number.

221798484 is an abundant number, since it is smaller than the sum of its proper divisors (339393420).

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

221798484 is a wasteful number, since it uses less digits than its factorization.

221798484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5884 (or 5879 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 221798484 is about 14892.9004562577. The cubic root of 221798484 is about 605.3216275895.

The spelling of 221798484 in words is "two hundred twenty-one million, seven hundred ninety-eight thousand, four hundred eighty-four".