6721113 has 8 divisors (see below), whose sum is σ = 10241728. Its totient is φ = 3840624.

The previous prime is 6721109. The next prime is 6721123. The reversal of 6721113 is 3111276.

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

It is not a de Polignac number, because 6721113 - 2² = 6721109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 320053 = 6721113 / (6 + 7 + 2 + 1 + 1 + 1 + 3).

6721113 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6721113.

It is not an unprimeable number, because it can be changed into a prime (6721123) 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, 160006 + ... + 160047.

It is an arithmetic number, because the mean of its divisors is an integer number (1280216).

Almost surely, 2^6721113 is an apocalyptic number.

It is an amenable number.

6721113 is a deficient number, since it is larger than the sum of its proper divisors (3520615).

6721113 is a wasteful number, since it uses less digits than its factorization.

6721113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320063.

The product of its digits is 252, while the sum is 21.

The square root of 6721113 is about 2592.5109450106. The cubic root of 6721113 is about 188.7181768784.

Adding to 6721113 its reverse (3111276), we get a palindrome (9832389).

The spelling of 6721113 in words is "six million, seven hundred twenty-one thousand, one hundred thirteen".