6857443121 has 8 divisors (see below), whose sum is σ = 7317244320. Its totient is φ = 6407530272.

The previous prime is 6857443067. The next prime is 6857443157. The reversal of 6857443121 is 1213447586.

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

It is a cyclic number.

It is not a de Polignac number, because 6857443121 - 2⁶ = 6857443057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6857443921) 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, 2470655 + ... + 2473428.

It is an arithmetic number, because the mean of its divisors is an integer number (914655540).

Almost surely, 2^6857443121 is an apocalyptic number.

It is an amenable number.

6857443121 is a deficient number, since it is larger than the sum of its proper divisors (459801199).

6857443121 is a wasteful number, since it uses less digits than its factorization.

6857443121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4944175.

The product of its digits is 161280, while the sum is 41.

The square root of 6857443121 is about 82809.6801165178. The cubic root of 6857443121 is about 1899.8562329815.

The spelling of 6857443121 in words is "six billion, eight hundred fifty-seven million, four hundred forty-three thousand, one hundred twenty-one".