6723462821 has 4 divisors (see below), whose sum is σ = 7118960652. Its totient is φ = 6327964992.

The previous prime is 6723462803. The next prime is 6723462829. The reversal of 6723462821 is 1282643276.

6723462821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 2005696225 + 4717766596 = 44785^2 + 68686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6723462821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6723462829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197748890 + ... + 197748923.

It is an arithmetic number, because the mean of its divisors is an integer number (1779740163).

Almost surely, 2^6723462821 is an apocalyptic number.

It is an amenable number.

6723462821 is a deficient number, since it is larger than the sum of its proper divisors (395497831).

6723462821 is a wasteful number, since it uses less digits than its factorization.

6723462821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395497830.

The product of its digits is 193536, while the sum is 41.

The square root of 6723462821 is about 81996.7244528707. The cubic root of 6723462821 is about 1887.4016739622.

The spelling of 6723462821 in words is "six billion, seven hundred twenty-three million, four hundred sixty-two thousand, eight hundred twenty-one".