243431221 has 8 divisors (see below), whose sum is σ = 265744800. Its totient is φ = 221148240.

The previous prime is 243431183. The next prime is 243431231. The reversal of 243431221 is 122134342.

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

It is a cyclic number.

It is not a de Polignac number, because 243431221 - 2⁹ = 243430709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243431192 and 243431201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243431231) 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, 10975 + ... + 24643.

It is an arithmetic number, because the mean of its divisors is an integer number (33218100).

Almost surely, 2^243431221 is an apocalyptic number.

It is an amenable number.

243431221 is a deficient number, since it is larger than the sum of its proper divisors (22313579).

243431221 is a wasteful number, since it uses less digits than its factorization.

243431221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15299.

The product of its digits is 1152, while the sum is 22.

The square root of 243431221 is about 15602.2825573696. The cubic root of 243431221 is about 624.3940546382.

Adding to 243431221 its reverse (122134342), we get a palindrome (365565563).

The spelling of 243431221 in words is "two hundred forty-three million, four hundred thirty-one thousand, two hundred twenty-one".