221988488 has 8 divisors (see below), whose sum is σ = 416228430. Its totient is φ = 110994240.

The previous prime is 221988469. The next prime is 221988491. The reversal of 221988488 is 884889122.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 192155044 + 29833444 = 13862^2 + 5462^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×221988488² = 98557777609052288, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 13874273 + ... + 13874288.

Almost surely, 2^221988488 is an apocalyptic number.

It is an amenable number.

221988488 is a deficient number, since it is larger than the sum of its proper divisors (194239942).

221988488 is a wasteful number, since it uses less digits than its factorization.

221988488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27748567 (or 27748563 counting only the distinct ones).

The product of its digits is 589824, while the sum is 50.

The square root of 221988488 is about 14899.2781033176. The cubic root of 221988488 is about 605.4944281453.

The spelling of 221988488 in words is "two hundred twenty-one million, nine hundred eighty-eight thousand, four hundred eighty-eight".