243121243504 has 20 divisors (see below), whose sum is σ = 491527732176. Its totient is φ = 116275377152.

The previous prime is 243121243459. The next prime is 243121243513. The reversal of 243121243504 is 405342121342.

243121243504 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×243121243504³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 330327409 + ... + 330328144.

Almost surely, 2^243121243504 is an apocalyptic number.

It is an amenable number.

243121243504 is an abundant number, since it is smaller than the sum of its proper divisors (248406488672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243121243504 is a wasteful number, since it uses less digits than its factorization.

243121243504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660655584 (or 660655578 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 243121243504 its reverse (405342121342), we get a palindrome (648463364846).

The spelling of 243121243504 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-three thousand, five hundred four".