243121445256 has 16 divisors (see below), whose sum is σ = 607803613200. Its totient is φ = 81040481744.

The previous prime is 243121445251. The next prime is 243121445291. The reversal of 243121445256 is 652544121342.

It is not an unprimeable number, because it can be changed into a prime (243121445251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5065030086 + ... + 5065030133.

It is an arithmetic number, because the mean of its divisors is an integer number (37987725825).

Almost surely, 2^243121445256 is an apocalyptic number.

It is an amenable number.

243121445256 is an abundant number, since it is smaller than the sum of its proper divisors (364682167944).

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

243121445256 is a wasteful number, since it uses less digits than its factorization.

243121445256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10130060228 (or 10130060224 counting only the distinct ones).

The product of its digits is 230400, while the sum is 39.

Adding to 243121445256 its reverse (652544121342), we get a palindrome (895665566598).

The spelling of 243121445256 in words is "two hundred forty-three billion, one hundred twenty-one million, four hundred forty-five thousand, two hundred fifty-six".