243121245040 has 80 divisors (see below), whose sum is σ = 571356957600. Its totient is φ = 96200729600.

The previous prime is 243121245013. The next prime is 243121245047. The reversal of 243121245040 is 40542121342.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121245047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9578286 + ... + 9603634.

It is an arithmetic number, because the mean of its divisors is an integer number (7141961970).

Almost surely, 2^243121245040 is an apocalyptic number.

243121245040 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 243121245040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285678478800).

243121245040 is an abundant number, since it is smaller than the sum of its proper divisors (328235712560).

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

243121245040 is a wasteful number, since it uses less digits than its factorization.

243121245040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26650 (or 26644 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 243121245040 its reverse (40542121342), we get a palindrome (283663366382).

The spelling of 243121245040 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, forty".