6921386979 has 16 divisors (see below), whose sum is σ = 9941578752. Its totient is φ = 4257953568.

The previous prime is 6921386963. The next prime is 6921386999. The reversal of 6921386979 is 9796831296.

It is not a de Polignac number, because 6921386979 - 2⁴ = 6921386963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6921386909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102894 + ... + 156300.

It is an arithmetic number, because the mean of its divisors is an integer number (621348672).

Almost surely, 2^6921386979 is an apocalyptic number.

6921386979 is a deficient number, since it is larger than the sum of its proper divisors (3020191773).

6921386979 is a wasteful number, since it uses less digits than its factorization.

6921386979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56746.

The product of its digits is 8817984, while the sum is 60.

The square root of 6921386979 is about 83194.8735139371. The cubic root of 6921386979 is about 1905.7431929137.

The spelling of 6921386979 in words is "six billion, nine hundred twenty-one million, three hundred eighty-six thousand, nine hundred seventy-nine".