4025126721 has 32 divisors (see below), whose sum is σ = 6704114688. Its totient is φ = 2086914240.

The previous prime is 4025126683. The next prime is 4025126723. The reversal of 4025126721 is 1276215204.

It is not a de Polignac number, because 4025126721 - 2¹⁴ = 4025110337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4025126723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104155 + ... + 137471.

It is an arithmetic number, because the mean of its divisors is an integer number (209503584).

Almost surely, 2^4025126721 is an apocalyptic number.

It is an amenable number.

4025126721 is a deficient number, since it is larger than the sum of its proper divisors (2678987967).

4025126721 is a wasteful number, since it uses less digits than its factorization.

4025126721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33861.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 4025126721 is about 63443.8863957750. The cubic root of 4025126721 is about 1590.7179649830.

The spelling of 4025126721 in words is "four billion, twenty-five million, one hundred twenty-six thousand, seven hundred twenty-one".