4218077721 has 16 divisors (see below), whose sum is σ = 6607339200. Its totient is φ = 2359763520.

The previous prime is 4218077711. The next prime is 4218077771. The reversal of 4218077721 is 1277708124.

It is not a de Polignac number, because 4218077721 - 2¹⁵ = 4218044953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 4218077721.

It is not an unprimeable number, because it can be changed into a prime (4218077711) 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 15 ways as a sum of consecutive naturals, for example, 4915746 + ... + 4916603.

It is an arithmetic number, because the mean of its divisors is an integer number (412958700).

Almost surely, 2^4218077721 is an apocalyptic number.

It is an amenable number.

4218077721 is a deficient number, since it is larger than the sum of its proper divisors (2389261479).

4218077721 is a wasteful number, since it uses less digits than its factorization.

4218077721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9832376.

The product of its (nonzero) digits is 43904, while the sum is 39.

The square root of 4218077721 is about 64946.7298714878. The cubic root of 4218077721 is about 1615.7401829674.

The spelling of 4218077721 in words is "four billion, two hundred eighteen million, seventy-seven thousand, seven hundred twenty-one".