221455 has 8 divisors (see below), whose sum is σ = 286272. Its totient is φ = 163488.

The previous prime is 221453. The next prime is 221461. The reversal of 221455 is 554122.

221455 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 221455 - 2¹ = 221453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1639 + ... + 1768.

It is an arithmetic number, because the mean of its divisors is an integer number (35784).

2²²¹⁴⁵⁵ is an apocalyptic number.

221455 is a deficient number, since it is larger than the sum of its proper divisors (64817).

221455 is a wasteful number, since it uses less digits than its factorization.

221455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3425.

The product of its digits is 400, while the sum is 19.

The square root of 221455 is about 470.5900551435. The cubic root of 221455 is about 60.5008992877.

Adding to 221455 its reverse (554122), we get a palindrome (775577).

It can be divided in two parts, 221 and 455, that added together give a palindrome (676).

The spelling of 221455 in words is "two hundred twenty-one thousand, four hundred fifty-five".