243121240000 has 140 divisors (see below), whose sum is σ = 604167854400. Its totient is φ = 97037824000.

The previous prime is 243121239973. The next prime is 243121240001. The reversal of 243121240000 is 42121342.

It is a self number, because there is not a number n which added to its sum of digits gives 243121240000.

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 19153656 + ... + 19166344.

Almost surely, 2^243121240000 is an apocalyptic number.

243121240000 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 243121240000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302083927200).

243121240000 is an abundant number, since it is smaller than the sum of its proper divisors (361046614400).

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

243121240000 is an equidigital number, since it uses as much as digits as its factorization.

243121240000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13200 (or 13175 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 243121240000 its reverse (42121342), we get a palindrome (243163361342).

The spelling of 243121240000 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty thousand".