8644710021 has 16 divisors (see below), whose sum is σ = 11976292800. Its totient is φ = 5539885568.

The previous prime is 8644710017. The next prime is 8644710037. The reversal of 8644710021 is 1200174468.

It is a cyclic number.

It is not a de Polignac number, because 8644710021 - 2² = 8644710017 is a prime.

It is a super-2 number, since 2×8644710021² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8644710071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199116 + ... + 238613.

It is an arithmetic number, because the mean of its divisors is an integer number (748518300).

Almost surely, 2^8644710021 is an apocalyptic number.

It is an amenable number.

8644710021 is a deficient number, since it is larger than the sum of its proper divisors (3331582779).

8644710021 is a wasteful number, since it uses less digits than its factorization.

8644710021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437988.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 8644710021 is about 92976.9327360287. The cubic root of 8644710021 is about 2052.3439396942.

Adding to 8644710021 its reverse (1200174468), we get a palindrome (9844884489).

The spelling of 8644710021 in words is "eight billion, six hundred forty-four million, seven hundred ten thousand, twenty-one".