221263 has 8 divisors (see below), whose sum is σ = 256928. Its totient is φ = 186624.

The previous prime is 221261. The next prime is 221281. The reversal of 221263 is 362122.

221263 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 a 8-Lehmer number, since φ(221263) divides (221263-1)⁸.

It is a cyclic number.

It is not a de Polignac number, because 221263 - 2¹ = 221261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221261) 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, 295 + ... + 727.

It is an arithmetic number, because the mean of its divisors is an integer number (32116).

2²²¹²⁶³ is an apocalyptic number.

221263 is a deficient number, since it is larger than the sum of its proper divisors (35665).

221263 is an equidigital number, since it uses as much as digits as its factorization.

221263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513.

The product of its digits is 144, while the sum is 16.

The square root of 221263 is about 470.3860116968. The cubic root of 221263 is about 60.4834096076.

Adding to 221263 its reverse (362122), we get a palindrome (583385).

It can be divided in two parts, 221 and 263, that added together give a palindrome (484).

The spelling of 221263 in words is "two hundred twenty-one thousand, two hundred sixty-three".