6721331306 has 4 divisors (see below), whose sum is σ = 10081996962. Its totient is φ = 3360665652.

The previous prime is 6721331291. The next prime is 6721331317. The reversal of 6721331306 is 6031331276.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6163663081 + 557668225 = 78509^2 + 23615^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1680332825 + ... + 1680332828.

Almost surely, 2^6721331306 is an apocalyptic number.

6721331306 is a deficient number, since it is larger than the sum of its proper divisors (3360665656).

6721331306 is a wasteful number, since it uses less digits than its factorization.

6721331306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3360665655.

The product of its (nonzero) digits is 13608, while the sum is 32.

The square root of 6721331306 is about 81983.7258606853. The cubic root of 6721331306 is about 1887.2022008486.

The spelling of 6721331306 in words is "six billion, seven hundred twenty-one million, three hundred thirty-one thousand, three hundred six".