221143 has 4 divisors (see below), whose sum is σ = 238168. Its totient is φ = 204120.

The previous prime is 221101. The next prime is 221159. The reversal of 221143 is 341122.

221143 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221143 - 2¹⁷ = 90071 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 17011 = 221143 / (2 + 2 + 1 + 1 + 4 + 3).

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8493 + ... + 8518.

It is an arithmetic number, because the mean of its divisors is an integer number (59542).

2²²¹¹⁴³ is an apocalyptic number.

221143 is a deficient number, since it is larger than the sum of its proper divisors (17025).

221143 is a wasteful number, since it uses less digits than its factorization.

221143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17024.

The product of its digits is 48, while the sum is 13.

The square root of 221143 is about 470.2584395840. The cubic root of 221143 is about 60.4724734190.

Adding to 221143 its reverse (341122), we get a palindrome (562265).

The spelling of 221143 in words is "two hundred twenty-one thousand, one hundred forty-three", and thus it is an iban number.