3221821 has 8 divisors (see below), whose sum is σ = 3326400. Its totient is φ = 3118560.

The previous prime is 3221819. The next prime is 3221899. The reversal of 3221821 is 1281223.

3221821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 3221821 - 2¹ = 3221819 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 (3221321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7120 + ... + 7558.

It is an arithmetic number, because the mean of its divisors is an integer number (415800).

Almost surely, 2^3221821 is an apocalyptic number.

It is an amenable number.

3221821 is a deficient number, since it is larger than the sum of its proper divisors (104579).

3221821 is a wasteful number, since it uses less digits than its factorization.

3221821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659.

The product of its digits is 192, while the sum is 19.

The square root of 3221821 is about 1794.9431745880. The cubic root of 3221821 is about 147.6954566706.

The spelling of 3221821 in words is "three million, two hundred twenty-one thousand, eight hundred twenty-one".