6821216 has 24 divisors (see below), whose sum is σ = 14220360. Its totient is φ = 3209728.

The previous prime is 6821207. The next prime is 6821231. The reversal of 6821216 is 6121286.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5726 + ... + 6813.

It is an arithmetic number, because the mean of its divisors is an integer number (592515).

Almost surely, 2^6821216 is an apocalyptic number.

It is an amenable number.

6821216 is an abundant number, since it is smaller than the sum of its proper divisors (7399144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6821216 is a wasteful number, since it uses less digits than its factorization.

6821216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12566 (or 12558 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 6821216 is about 2611.7457762960. The cubic root of 6821216 is about 189.6504746719.

The spelling of 6821216 in words is "six million, eight hundred twenty-one thousand, two hundred sixteen".