6721133 has 2 divisors, whose sum is σ = 6721134. Its totient is φ = 6721132.

The previous prime is 6721123. The next prime is 6721147. The reversal of 6721133 is 3311276.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4401604 + 2319529 = 2098^2 + 1523^2 .

It is a cyclic number.

It is not a de Polignac number, because 6721133 - 2¹² = 6717037 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6721099 and 6721108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6721123) 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 as a sum of consecutive naturals, namely, 3360566 + 3360567.

It is an arithmetic number, because the mean of its divisors is an integer number (3360567).

Almost surely, 2^6721133 is an apocalyptic number.

It is an amenable number.

6721133 is a deficient number, since it is larger than the sum of its proper divisors (1).

6721133 is an equidigital number, since it uses as much as digits as its factorization.

6721133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 23.

The square root of 6721133 is about 2592.5148022721. The cubic root of 6721133 is about 188.7183640676.

The spelling of 6721133 in words is "six million, seven hundred twenty-one thousand, one hundred thirty-three".