243121220343 has 24 divisors (see below), whose sum is σ = 366774351840. Its totient is φ = 154893879360.

The previous prime is 243121220339. The next prime is 243121220351. The reversal of 243121220343 is 343022121342.

243121220343 is a `hidden beast` number, since 2 + 4 + 312 + 1 + 2 + 2 + 0 + 343 = 666.

It is not a de Polignac number, because 243121220343 - 2² = 243121220339 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121220323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 299968 + ... + 759093.

It is an arithmetic number, because the mean of its divisors is an integer number (15282264660).

Almost surely, 2^243121220343 is an apocalyptic number.

243121220343 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

243121220343 is a deficient number, since it is larger than the sum of its proper divisors (123653131497).

243121220343 is a wasteful number, since it uses less digits than its factorization.

243121220343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060199 (or 1060196 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 243121220343 its reverse (343022121342), we get a palindrome (586143341685).

Subtracting 243121220343 from its reverse (343022121342), we obtain a palindrome (99900900999).

The spelling of 243121220343 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred twenty thousand, three hundred forty-three".