6721143 has 16 divisors (see below), whose sum is σ = 10528896. Its totient is φ = 3759840.

The previous prime is 6721133. The next prime is 6721147. The reversal of 6721143 is 3411276.

It is not a de Polignac number, because 6721143 - 2⁸ = 6720887 is a prime.

It is a super-3 number, since 3×6721143³ (a number of 21 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721147) 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, 7405 + ... + 8262.

It is an arithmetic number, because the mean of its divisors is an integer number (658056).

Almost surely, 2^6721143 is an apocalyptic number.

6721143 is a deficient number, since it is larger than the sum of its proper divisors (3807753).

6721143 is a wasteful number, since it uses less digits than its factorization.

6721143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15694.

The product of its digits is 1008, while the sum is 24.

The square root of 6721143 is about 2592.5167309007. The cubic root of 6721143 is about 188.7184576621.

The spelling of 6721143 in words is "six million, seven hundred twenty-one thousand, one hundred forty-three".