6721009741 has 4 divisors (see below), whose sum is σ = 6721828092. Its totient is φ = 6720191392.

The previous prime is 6721009709. The next prime is 6721009787. The reversal of 6721009741 is 1479001276.

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 3809975625 + 2911034116 = 61725^2 + 53954^2 .

It is a cyclic number.

It is not a de Polignac number, because 6721009741 - 2⁵ = 6721009709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6721009741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721009741) 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, 396730 + ... + 413323.

It is an arithmetic number, because the mean of its divisors is an integer number (1680457023).

Almost surely, 2^6721009741 is an apocalyptic number.

It is an amenable number.

6721009741 is a deficient number, since it is larger than the sum of its proper divisors (818351).

6721009741 is an equidigital number, since it uses as much as digits as its factorization.

6721009741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818350.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 6721009741 is about 81981.7646858129. The cubic root of 6721009741 is about 1887.1721042390.

The spelling of 6721009741 in words is "six billion, seven hundred twenty-one million, nine thousand, seven hundred forty-one".