6722807321 has 4 divisors (see below), whose sum is σ = 6723265572. Its totient is φ = 6722349072.

The previous prime is 6722807303. The next prime is 6722807327. The reversal of 6722807321 is 1237082276.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3759529225 + 2963278096 = 61315^2 + 54436^2 .

It is a cyclic number.

It is not a de Polignac number, because 6722807321 - 2¹⁰ = 6722806297 is a prime.

It is a super-2 number, since 2×6722807321² = 90392276550582394082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6722807327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206366 + ... + 236711.

It is an arithmetic number, because the mean of its divisors is an integer number (1680816393).

Almost surely, 2^6722807321 is an apocalyptic number.

It is an amenable number.

6722807321 is a deficient number, since it is larger than the sum of its proper divisors (458251).

6722807321 is a wasteful number, since it uses less digits than its factorization.

6722807321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458250.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 6722807321 is about 81992.7272445551. The cubic root of 6722807321 is about 1887.3403349350.

Adding to 6722807321 its reverse (1237082276), we get a palindrome (7959889597).

The spelling of 6722807321 in words is "six billion, seven hundred twenty-two million, eight hundred seven thousand, three hundred twenty-one".