4256343721 has 16 divisors (see below), whose sum is σ = 4957747200. Its totient is φ = 3578552208.

The previous prime is 4256343709. The next prime is 4256343733. The reversal of 4256343721 is 1273436524.

It is an interprime number because it is at equal distance from previous prime (4256343709) and next prime (4256343733).

It is not a de Polignac number, because 4256343721 - 2¹⁵ = 4256310953 is a prime.

It is a super-2 number, since 2×4256343721² = 36232923742592251682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4256343781) 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 15 ways as a sum of consecutive naturals, for example, 180090 + ... + 202348.

It is an arithmetic number, because the mean of its divisors is an integer number (309859200).

Almost surely, 2^4256343721 is an apocalyptic number.

It is an amenable number.

4256343721 is a deficient number, since it is larger than the sum of its proper divisors (701403479).

4256343721 is a wasteful number, since it uses less digits than its factorization.

4256343721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22788.

The product of its digits is 120960, while the sum is 37.

The square root of 4256343721 is about 65240.6600288501. The cubic root of 4256343721 is about 1620.6114291371.

The spelling of 4256343721 in words is "four billion, two hundred fifty-six million, three hundred forty-three thousand, seven hundred twenty-one".