243155033221 has 8 divisors (see below), whose sum is σ = 244624867200. Its totient is φ = 241685364048.

The previous prime is 243155033207. The next prime is 243155033237. The reversal of 243155033221 is 122330551342.

243155033221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 243155033221 - 2²³ = 243146644613 is a prime.

It is a super-2 number, since 2×243155033221² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243155033021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4280215 + ... + 4336651.

It is an arithmetic number, because the mean of its divisors is an integer number (30578108400).

Almost surely, 2^243155033221 is an apocalyptic number.

It is an amenable number.

243155033221 is a deficient number, since it is larger than the sum of its proper divisors (1469833979).

243155033221 is a wasteful number, since it uses less digits than its factorization.

243155033221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82403.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 243155033221 its reverse (122330551342), we get a palindrome (365485584563).

The spelling of 243155033221 in words is "two hundred forty-three billion, one hundred fifty-five million, thirty-three thousand, two hundred twenty-one".