243221111 has 4 divisors (see below), whose sum is σ = 277966992. Its totient is φ = 208475232.

The previous prime is 243221107. The next prime is 243221161. The reversal of 243221111 is 111122342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111122342 = 2 ⋅55561171.

It is not a de Polignac number, because 243221111 - 2² = 243221107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243221111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243221161) 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, 17372930 + ... + 17372943.

It is an arithmetic number, because the mean of its divisors is an integer number (69491748).

Almost surely, 2^243221111 is an apocalyptic number.

243221111 is a deficient number, since it is larger than the sum of its proper divisors (34745881).

243221111 is an equidigital number, since it uses as much as digits as its factorization.

243221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34745880.

The product of its digits is 96, while the sum is 17.

The square root of 243221111 is about 15595.5477941623. The cubic root of 243221111 is about 624.2143609011.

Adding to 243221111 its reverse (111122342), we get a palindrome (354343453).

The spelling of 243221111 in words is "two hundred forty-three million, two hundred twenty-one thousand, one hundred eleven".