221282489 has 8 divisors (see below), whose sum is σ = 234627840. Its totient is φ = 207973696.

The previous prime is 221282447. The next prime is 221282513. The reversal of 221282489 is 984282122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221282489 - 2²⁰ = 220233913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221282989) 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 7 ways as a sum of consecutive naturals, for example, 3872 + ... + 21390.

It is an arithmetic number, because the mean of its divisors is an integer number (29328480).

Almost surely, 2^221282489 is an apocalyptic number.

It is an amenable number.

221282489 is a deficient number, since it is larger than the sum of its proper divisors (13345351).

221282489 is a wasteful number, since it uses less digits than its factorization.

221282489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18279.

The product of its digits is 36864, while the sum is 38.

The square root of 221282489 is about 14875.5668463424. The cubic root of 221282489 is about 604.8518536246.

The spelling of 221282489 in words is "two hundred twenty-one million, two hundred eighty-two thousand, four hundred eighty-nine".