2129120256 has 176 divisors, whose sum is σ = 6119383680. Its totient is φ = 655687680.

The previous prime is 2129120251. The next prime is 2129120309. The reversal of 2129120256 is 6520219212.

It is not an unprimeable number, because it can be changed into a prime (2129120251) 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, 3080871 + ... + 3081561.

Almost surely, 2^2129120256 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 2129120256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3059691840).

2129120256 is an abundant number, since it is smaller than the sum of its proper divisors (3990263424).

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

2129120256 is a wasteful number, since it uses less digits than its factorization.

2129120256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790 (or 772 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 2129120256 is about 46142.3910953908. The cubic root of 2129120256 is about 1286.4711873677.

Adding to 2129120256 its reverse (6520219212), we get a palindrome (8649339468).

The spelling of 2129120256 in words is "two billion, one hundred twenty-nine million, one hundred twenty thousand, two hundred fifty-six".