6855907421 has 8 divisors (see below), whose sum is σ = 7538064384. Its totient is φ = 6183565920.

The previous prime is 6855907417. The next prime is 6855907423. The reversal of 6855907421 is 1247095586.

It is a happy number.

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 6855907421 - 2² = 6855907417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6855907423) 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, 2452400 + ... + 2455193.

It is an arithmetic number, because the mean of its divisors is an integer number (942258048).

Almost surely, 2^6855907421 is an apocalyptic number.

It is an amenable number.

6855907421 is a deficient number, since it is larger than the sum of its proper divisors (682156963).

6855907421 is a wasteful number, since it uses less digits than its factorization.

6855907421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4907731.

The product of its (nonzero) digits is 604800, while the sum is 47.

The square root of 6855907421 is about 82800.4071306416. The cubic root of 6855907421 is about 1899.7144003777.

The spelling of 6855907421 in words is "six billion, eight hundred fifty-five million, nine hundred seven thousand, four hundred twenty-one".