221444288 has 28 divisors (see below), whose sum is σ = 473232480. Its totient is φ = 102204672.

The previous prime is 221444273. The next prime is 221444303. The reversal of 221444288 is 882444122.

221444288 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221444273) and next prime (221444303).

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

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

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 in 3 ways as a sum of consecutive naturals, for example, 132248 + ... + 133911.

It is an arithmetic number, because the mean of its divisors is an integer number (16901160).

Almost surely, 2^221444288 is an apocalyptic number.

It is an amenable number.

221444288 is an abundant number, since it is smaller than the sum of its proper divisors (251788192).

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

221444288 is a wasteful number, since it uses less digits than its factorization.

221444288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266184 (or 266174 counting only the distinct ones).

The product of its digits is 32768, while the sum is 35.

The square root of 221444288 is about 14881.0042671857. The cubic root of 221444288 is about 604.9992377560. Note that the first 3 decimals are identical.

The spelling of 221444288 in words is "two hundred twenty-one million, four hundred forty-four thousand, two hundred eighty-eight".