221111143 has 4 divisors (see below), whose sum is σ = 241212168. Its totient is φ = 201010120.

The previous prime is 221111141. The next prime is 221111159. The reversal of 221111143 is 341111122.

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 221111143 - 2¹ = 221111141 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 (221111141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10050496 + ... + 10050517.

It is an arithmetic number, because the mean of its divisors is an integer number (60303042).

Almost surely, 2^221111143 is an apocalyptic number.

221111143 is a deficient number, since it is larger than the sum of its proper divisors (20101025).

221111143 is a wasteful number, since it uses less digits than its factorization.

221111143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20101024.

The product of its digits is 48, while the sum is 16.

The square root of 221111143 is about 14869.8064210668. The cubic root of 221111143 is about 604.6956946985.

Adding to 221111143 its reverse (341111122), we get a palindrome (562222265).

The spelling of 221111143 in words is "two hundred twenty-one million, one hundred eleven thousand, one hundred forty-three".