243121245240 has 64 divisors (see below), whose sum is σ = 772267491360. Its totient is φ = 61018664960.

The previous prime is 243121245239. The next prime is 243121245259. The reversal of 243121245240 is 42542121342.

It is a happy number.

243121245240 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 3×243121245240³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 243121245198 and 243121245207.

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 15 ways as a sum of consecutive naturals, for example, 59586501 + ... + 59590580.

Almost surely, 2^243121245240 is an apocalyptic number.

243121245240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243121245240 is an abundant number, since it is smaller than the sum of its proper divisors (529146246120).

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

243121245240 is a wasteful number, since it uses less digits than its factorization.

243121245240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119177112 (or 119177108 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 243121245240 its reverse (42542121342), we get a palindrome (285663366582).

The spelling of 243121245240 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, two hundred forty".