243121240004 has 12 divisors (see below), whose sum is σ = 450489356604. Its totient is φ = 114409995264.

The previous prime is 243121240001. The next prime is 243121240049. The reversal of 243121240004 is 400042121342.

It can be written as a sum of positive squares in 2 ways, for example, as 132385367104 + 110735872900 = 363848^2 + 332770^2 .

It is not an unprimeable number, because it can be changed into a prime (243121240001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1787656109 + ... + 1787656244.

It is an arithmetic number, because the mean of its divisors is an integer number (37540779717).

Almost surely, 2^243121240004 is an apocalyptic number.

It is an amenable number.

243121240004 is a deficient number, since it is larger than the sum of its proper divisors (207368116600).

243121240004 is a wasteful number, since it uses less digits than its factorization.

243121240004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3575312374 (or 3575312372 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 243121240004 its reverse (400042121342), we get a palindrome (643163361346).

The spelling of 243121240004 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty thousand, four".