221488 has 20 divisors (see below), whose sum is σ = 436480. Its totient is φ = 108864.

The previous prime is 221477. The next prime is 221489. The reversal of 221488 is 884122.

221488 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (221489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1681 + ... + 1807.

It is an arithmetic number, because the mean of its divisors is an integer number (21824).

2²²¹⁴⁸⁸ is an apocalyptic number.

It is an amenable number.

221488 is a deficient number, since it is larger than the sum of its proper divisors (214992).

221488 is a wasteful number, since it uses less digits than its factorization.

221488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 238 counting only the distinct ones).

The product of its digits is 1024, while the sum is 25.

The square root of 221488 is about 470.6251162018. The cubic root of 221488 is about 60.5039043083.

The spelling of 221488 in words is "two hundred twenty-one thousand, four hundred eighty-eight".