6967979721 has 20 divisors (see below), whose sum is σ = 10551554772. Its totient is φ = 4581681408.

The previous prime is 6967979717. The next prime is 6967979741. The reversal of 6967979721 is 1279797696.

6967979721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2387397321 + 4580582400 = 48861^2 + 67680^2 .

It is not a de Polignac number, because 6967979721 - 2² = 6967979717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6967979741) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 583296 + ... + 595121.

Almost surely, 2^6967979721 is an apocalyptic number.

It is an amenable number.

6967979721 is a deficient number, since it is larger than the sum of its proper divisors (3583575051).

6967979721 is a wasteful number, since it uses less digits than its factorization.

6967979721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178502 (or 1178493 counting only the distinct ones).

The product of its digits is 18003384, while the sum is 63.

The square root of 6967979721 is about 83474.4255505841. The cubic root of 6967979721 is about 1910.0099339779.

The spelling of 6967979721 in words is "six billion, nine hundred sixty-seven million, nine hundred seventy-nine thousand, seven hundred twenty-one".