6857221 has 8 divisors (see below), whose sum is σ = 7918400. Its totient is φ = 5816448.

The previous prime is 6857219. The next prime is 6857269. The reversal of 6857221 is 1227586.

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 6857221 - 2¹ = 6857219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6857281) 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, 4371 + ... + 5728.

It is an arithmetic number, because the mean of its divisors is an integer number (989800).

Almost surely, 2^6857221 is an apocalyptic number.

It is an amenable number.

6857221 is a deficient number, since it is larger than the sum of its proper divisors (1061179).

6857221 is a wasteful number, since it uses less digits than its factorization.

6857221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10203.

The product of its digits is 6720, while the sum is 31.

The square root of 6857221 is about 2618.6296034376. The cubic root of 6857221 is about 189.9835719868.

The spelling of 6857221 in words is "six million, eight hundred fifty-seven thousand, two hundred twenty-one".