6921284679 has 48 divisors (see below), whose sum is σ = 10945334400. Its totient is φ = 4358533536.

The previous prime is 6921284659. The next prime is 6921284723. The reversal of 6921284679 is 9764821296.

It is not a de Polignac number, because 6921284679 - 2¹¹ = 6921282631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6921284609) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1720132 + ... + 1724150.

It is an arithmetic number, because the mean of its divisors is an integer number (228027800).

Almost surely, 2^6921284679 is an apocalyptic number.

6921284679 is a deficient number, since it is larger than the sum of its proper divisors (4024049721).

6921284679 is a wasteful number, since it uses less digits than its factorization.

6921284679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4426 (or 4414 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 6921284679 is about 83194.2586901284. The cubic root of 6921284679 is about 1905.7338037316.

It can be divided in two parts, 6921 and 284679, that added together give a square (291600 = 540²).

The spelling of 6921284679 in words is "six billion, nine hundred twenty-one million, two hundred eighty-four thousand, six hundred seventy-nine".