6929799921 has 24 divisors (see below), whose sum is σ = 10989261504. Its totient is φ = 4173118560.

The previous prime is 6929799911. The next prime is 6929799937. The reversal of 6929799921 is 1299979296.

It is not a de Polignac number, because 6929799921 - 2¹⁷ = 6929668849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6929799911) 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 23 ways as a sum of consecutive naturals, for example, 207381 + ... + 238466.

It is an arithmetic number, because the mean of its divisors is an integer number (457885896).

Almost surely, 2^6929799921 is an apocalyptic number.

It is an amenable number.

6929799921 is a deficient number, since it is larger than the sum of its proper divisors (4059461583).

6929799921 is a wasteful number, since it uses less digits than its factorization.

6929799921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446021 (or 446018 counting only the distinct ones).

The product of its digits is 9920232, while the sum is 63.

The square root of 6929799921 is about 83245.4198199517. The cubic root of 6929799921 is about 1906.5150235398.

The spelling of 6929799921 in words is "six billion, nine hundred twenty-nine million, seven hundred ninety-nine thousand, nine hundred twenty-one".