4055447721 has 8 divisors (see below), whose sum is σ = 5823207040. Its totient is φ = 2495660112.

The previous prime is 4055447707. The next prime is 4055447729. The reversal of 4055447721 is 1277445504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4055447721 - 2²³ = 4047059113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 103985839 = 4055447721 / (4 + 0 + 5 + 5 + 4 + 4 + 7 + 7 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4055447721.

It is not an unprimeable number, because it can be changed into a prime (4055447729) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 51992881 + ... + 51992958.

It is an arithmetic number, because the mean of its divisors is an integer number (727900880).

Almost surely, 2^4055447721 is an apocalyptic number.

It is an amenable number.

4055447721 is a deficient number, since it is larger than the sum of its proper divisors (1767759319).

4055447721 is a wasteful number, since it uses less digits than its factorization.

4055447721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103985855.

The product of its (nonzero) digits is 156800, while the sum is 39.

The square root of 4055447721 is about 63682.3972617237. The cubic root of 4055447721 is about 1594.7022332412.

The spelling of 4055447721 in words is "four billion, fifty-five million, four hundred forty-seven thousand, seven hundred twenty-one".