243244221 has 8 divisors (see below), whose sum is σ = 353809824. Its totient is φ = 147420720.

The previous prime is 243244219. The next prime is 243244247. The reversal of 243244221 is 122442342.

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

It is not a de Polignac number, because 243244221 - 2¹ = 243244219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243244191 and 243244200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243244121) 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, 3685486 + ... + 3685551.

It is an arithmetic number, because the mean of its divisors is an integer number (44226228).

Almost surely, 2^243244221 is an apocalyptic number.

It is an amenable number.

243244221 is a deficient number, since it is larger than the sum of its proper divisors (110565603).

243244221 is a wasteful number, since it uses less digits than its factorization.

243244221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7371051.

The product of its digits is 3072, while the sum is 24.

The square root of 243244221 is about 15596.2886931475. The cubic root of 243244221 is about 624.2341304802.

Adding to 243244221 its reverse (122442342), we get a palindrome (365686563).

The spelling of 243244221 in words is "two hundred forty-three million, two hundred forty-four thousand, two hundred twenty-one".