243221133 has 8 divisors (see below), whose sum is σ = 334756096. Its totient is φ = 156916800.

The previous prime is 243221107. The next prime is 243221161. The reversal of 243221133 is 331122342.

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

It is not a de Polignac number, because 243221133 - 2⁸ = 243220877 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 (243221233) 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, 1307548 + ... + 1307733.

It is an arithmetic number, because the mean of its divisors is an integer number (41844512).

Almost surely, 2^243221133 is an apocalyptic number.

It is an amenable number.

243221133 is a deficient number, since it is larger than the sum of its proper divisors (91534963).

243221133 is a wasteful number, since it uses less digits than its factorization.

243221133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2615315.

The product of its digits is 864, while the sum is 21.

The square root of 243221133 is about 15595.5484994918. The cubic root of 243221133 is about 624.2143797217.

Adding to 243221133 its reverse (331122342), we get a palindrome (574343475).

The spelling of 243221133 in words is "two hundred forty-three million, two hundred twenty-one thousand, one hundred thirty-three".