243121240233 has 48 divisors (see below), whose sum is σ = 378968029440. Its totient is φ = 155627864784.

The previous prime is 243121240223. The next prime is 243121240249. The reversal of 243121240233 is 332042121342.

243121240233 is a `hidden beast` number, since 2 + 43 + 1 + 212 + 402 + 3 + 3 = 666.

It is not a de Polignac number, because 243121240233 - 2²² = 243117045929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 243121240197 and 243121240206.

It is not an unprimeable number, because it can be changed into a prime (243121240223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 419310 + ... + 813672.

It is an arithmetic number, because the mean of its divisors is an integer number (7895167280).

Almost surely, 2^243121240233 is an apocalyptic number.

It is an amenable number.

243121240233 is a deficient number, since it is larger than the sum of its proper divisors (135846789207).

243121240233 is an equidigital number, since it uses as much as digits as its factorization.

243121240233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394480 (or 394468 counting only the distinct ones).

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

Adding to 243121240233 its reverse (332042121342), we get a palindrome (575163361575).

The spelling of 243121240233 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty thousand, two hundred thirty-three".