8444612721 has 8 divisors (see below), whose sum is σ = 11385995040. Its totient is φ = 5566486112.

The previous prime is 8444612707. The next prime is 8444612773. The reversal of 8444612721 is 1272164448.

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

It is a cyclic number.

It is not a de Polignac number, because 8444612721 - 2¹¹ = 8444610673 is a prime.

It is a super-2 number, since 2×8444612721² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8444612721.

It is not an unprimeable number, because it can be changed into a prime (8444612021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15813615 + ... + 15814148.

It is an arithmetic number, because the mean of its divisors is an integer number (1423249380).

Almost surely, 2^8444612721 is an apocalyptic number.

It is an amenable number.

8444612721 is a deficient number, since it is larger than the sum of its proper divisors (2941382319).

8444612721 is a wasteful number, since it uses less digits than its factorization.

8444612721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31627855.

The product of its digits is 86016, while the sum is 39.

The square root of 8444612721 is about 91894.5739475406. The cubic root of 8444612721 is about 2036.3851079293.

The spelling of 8444612721 in words is "eight billion, four hundred forty-four million, six hundred twelve thousand, seven hundred twenty-one".