243021385128 has 128 divisors (see below), whose sum is σ = 635958576000. Its totient is φ = 77318323200.

The previous prime is 243021385099. The next prime is 243021385141. The reversal of 243021385128 is 821583120342.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9763563 + ... + 9788421.

It is an arithmetic number, because the mean of its divisors is an integer number (4968426375).

Almost surely, 2^243021385128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243021385128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317979288000).

243021385128 is an abundant number, since it is smaller than the sum of its proper divisors (392937190872).

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

243021385128 is a wasteful number, since it uses less digits than its factorization.

243021385128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25115 (or 25111 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The spelling of 243021385128 in words is "two hundred forty-three billion, twenty-one million, three hundred eighty-five thousand, one hundred twenty-eight".