6869812821 has 8 divisors (see below), whose sum is σ = 9160136544. Its totient is φ = 4579682160.

The previous prime is 6869812819. The next prime is 6869812841. The reversal of 6869812821 is 1282189686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6869812821 - 2¹ = 6869812819 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6869812841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98670 + ... + 153216.

It is an arithmetic number, because the mean of its divisors is an integer number (1145017068).

Almost surely, 2^6869812821 is an apocalyptic number.

It is an amenable number.

6869812821 is a deficient number, since it is larger than the sum of its proper divisors (2290323723).

6869812821 is a wasteful number, since it uses less digits than its factorization.

6869812821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96531.

The product of its digits is 663552, while the sum is 51.

The square root of 6869812821 is about 82884.3339902059. Note that the first 3 decimals coincide. The cubic root of 6869812821 is about 1900.9978895697.

The spelling of 6869812821 in words is "six billion, eight hundred sixty-nine million, eight hundred twelve thousand, eight hundred twenty-one".