221045 has 8 divisors (see below), whose sum is σ = 289440. Its totient is φ = 160720.

The previous prime is 221021. The next prime is 221047. The reversal of 221045 is 540122.

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

It is not a de Polignac number, because 221045 - 2⁸ = 220789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221047) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1955 + ... + 2064.

It is an arithmetic number, because the mean of its divisors is an integer number (36180).

2²²¹⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

221045 is a deficient number, since it is larger than the sum of its proper divisors (68395).

221045 is a wasteful number, since it uses less digits than its factorization.

221045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4035.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 221045 is about 470.1542300139. The cubic root of 221045 is about 60.4635392633.

Adding to 221045 its reverse (540122), we get a palindrome (761167).

The spelling of 221045 in words is "two hundred twenty-one thousand, forty-five".