243113121240 has 128 divisors (see below), whose sum is σ = 796886968320. Its totient is φ = 58844364800.

The previous prime is 243113121197. The next prime is 243113121241. The reversal of 243113121240 is 42121311342.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 243113121240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243113121241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 702457 + ... + 989783.

It is an arithmetic number, because the mean of its divisors is an integer number (6225679440).

Almost surely, 2^243113121240 is an apocalyptic number.

243113121240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243113121240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (398443484160).

243113121240 is an abundant number, since it is smaller than the sum of its proper divisors (553773847080).

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

243113121240 is a wasteful number, since it uses less digits than its factorization.

243113121240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287993 (or 287989 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 243113121240 its reverse (42121311342), we get a palindrome (285234432582).

The spelling of 243113121240 in words is "two hundred forty-three billion, one hundred thirteen million, one hundred twenty-one thousand, two hundred forty".