243121355331 has 8 divisors (see below), whose sum is σ = 324180037824. Its totient is φ = 162071788200.

The previous prime is 243121355297. The next prime is 243121355359. The reversal of 243121355331 is 133553121342.

243121355331 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 not a de Polignac number, because 243121355331 - 2¹⁷ = 243121224259 is a prime.

It is a super-2 number, since 2×243121355331² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243121355292 and 243121355301.

It is not an unprimeable number, because it can be changed into a prime (243121351331) 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, 2216361 + ... + 2323466.

It is an arithmetic number, because the mean of its divisors is an integer number (40522504728).

Almost surely, 2^243121355331 is an apocalyptic number.

243121355331 is a deficient number, since it is larger than the sum of its proper divisors (81058682493).

243121355331 is a wasteful number, since it uses less digits than its factorization.

243121355331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4557681.

The product of its digits is 32400, while the sum is 33.

Adding to 243121355331 its reverse (133553121342), we get a palindrome (376674476673).

The spelling of 243121355331 in words is "two hundred forty-three billion, one hundred twenty-one million, three hundred fifty-five thousand, three hundred thirty-one".