6851110921 has 4 divisors (see below), whose sum is σ = 6853770000. Its totient is φ = 6848451844.

The previous prime is 6851110913. The next prime is 6851110939. The reversal of 6851110921 is 1290111586.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1290111586 = 2 ⋅645055793.

It is a cyclic number.

It is not a de Polignac number, because 6851110921 - 2³ = 6851110913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6851110121) 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, 1325671 + ... + 1330828.

It is an arithmetic number, because the mean of its divisors is an integer number (1713442500).

Almost surely, 2^6851110921 is an apocalyptic number.

It is an amenable number.

6851110921 is a deficient number, since it is larger than the sum of its proper divisors (2659079).

6851110921 is a wasteful number, since it uses less digits than its factorization.

6851110921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2659078.

The product of its (nonzero) digits is 4320, while the sum is 34.

The square root of 6851110921 is about 82771.4378333493. The cubic root of 6851110921 is about 1899.2712737255.

The spelling of 6851110921 in words is "six billion, eight hundred fifty-one million, one hundred ten thousand, nine hundred twenty-one".