243421331520 has 224 divisors, whose sum is σ = 788578560000. Its totient is φ = 63599745024.

The previous prime is 243421331509. The next prime is 243421331521. The reversal of 243421331520 is 25133124342.

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

It is not an unprimeable number, because it can be changed into a prime (243421331521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17381481 + ... + 17395479.

It is an arithmetic number, because the mean of its divisors is an integer number (3520440000).

Almost surely, 2^243421331520 is an apocalyptic number.

243421331520 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 243421331520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (394289280000).

243421331520 is an abundant number, since it is smaller than the sum of its proper divisors (545157228480).

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

243421331520 is a wasteful number, since it uses less digits than its factorization.

243421331520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14385 (or 14375 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 243421331520 its reverse (25133124342), we get a palindrome (268554455862).

The spelling of 243421331520 in words is "two hundred forty-three billion, four hundred twenty-one million, three hundred thirty-one thousand, five hundred twenty".