6764971421 has 4 divisors (see below), whose sum is σ = 7285353852. Its totient is φ = 6244588992.

The previous prime is 6764971417. The next prime is 6764971427. The reversal of 6764971421 is 1241794676.

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 2476555225 + 4288416196 = 49765^2 + 65486^2 .

It is a cyclic number.

It is not a de Polignac number, because 6764971421 - 2² = 6764971417 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 (6764971427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260191196 + ... + 260191221.

It is an arithmetic number, because the mean of its divisors is an integer number (1821338463).

Almost surely, 2^6764971421 is an apocalyptic number.

It is an amenable number.

6764971421 is a deficient number, since it is larger than the sum of its proper divisors (520382431).

6764971421 is a wasteful number, since it uses less digits than its factorization.

6764971421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520382430.

The product of its digits is 508032, while the sum is 47.

The square root of 6764971421 is about 82249.4463264039. The cubic root of 6764971421 is about 1891.2777881604.

The spelling of 6764971421 in words is "six billion, seven hundred sixty-four million, nine hundred seventy-one thousand, four hundred twenty-one".