6799921921 has 4 divisors (see below), whose sum is σ = 7322992852. Its totient is φ = 6276850992.

The previous prime is 6799921897. The next prime is 6799921927. The reversal of 6799921921 is 1291299976.

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 897841296 + 5902080625 = 29964^2 + 76825^2 .

It is a cyclic number.

It is not a de Polignac number, because 6799921921 - 2¹¹ = 6799919873 is a prime.

It is a super-3 number, since 3×6799921921³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6799921927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261535446 + ... + 261535471.

It is an arithmetic number, because the mean of its divisors is an integer number (1830748213).

Almost surely, 2^6799921921 is an apocalyptic number.

It is an amenable number.

6799921921 is a deficient number, since it is larger than the sum of its proper divisors (523070931).

6799921921 is a wasteful number, since it uses less digits than its factorization.

6799921921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523070930.

The product of its digits is 1102248, while the sum is 55.

The square root of 6799921921 is about 82461.6390875175. The cubic root of 6799921921 is about 1894.5292231914.

The spelling of 6799921921 in words is "six billion, seven hundred ninety-nine million, nine hundred twenty-one thousand, nine hundred twenty-one".