6716720021 has 8 divisors (see below), whose sum is σ = 7328316864. Its totient is φ = 6105287520.

The previous prime is 6716720011. The next prime is 6716720029. The reversal of 6716720021 is 1200276176.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6716720021 is a prime.

It is a super-2 number, since 2×6716720021² = 90228655681004480882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6716720021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6716720029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53945 + ... + 127841.

It is an arithmetic number, because the mean of its divisors is an integer number (916039608).

Almost surely, 2^6716720021 is an apocalyptic number.

It is an amenable number.

6716720021 is a deficient number, since it is larger than the sum of its proper divisors (611596843).

6716720021 is a wasteful number, since it uses less digits than its factorization.

6716720021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82171.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 6716720021 is about 81955.5978625011. The cubic root of 6716720021 is about 1886.7705195981.

Adding to 6716720021 its reverse (1200276176), we get a palindrome (7916996197).

The spelling of 6716720021 in words is "six billion, seven hundred sixteen million, seven hundred twenty thousand, twenty-one".