4243121256 has 256 divisors, whose sum is σ = 12648130560. Its totient is φ = 1171906560.

The previous prime is 4243121243. The next prime is 4243121321. The reversal of 4243121256 is 6521213424.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30971620 + ... + 30971756.

It is an arithmetic number, because the mean of its divisors is an integer number (49406760).

Almost surely, 2^4243121256 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 4243121256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6324065280).

4243121256 is an abundant number, since it is smaller than the sum of its proper divisors (8405009304).

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

4243121256 is a wasteful number, since it uses less digits than its factorization.

4243121256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344 (or 340 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 4243121256 is about 65139.2451291846. The cubic root of 4243121256 is about 1618.9315283353.

The spelling of 4243121256 in words is "four billion, two hundred forty-three million, one hundred twenty-one thousand, two hundred fifty-six".