3221813 has 16 divisors (see below), whose sum is σ = 3888000. Its totient is φ = 2611392.

The previous prime is 3221809. The next prime is 3221819. The reversal of 3221813 is 3181223.

It is not a de Polignac number, because 3221813 - 2² = 3221809 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 (3221819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11843 + ... + 12111.

It is an arithmetic number, because the mean of its divisors is an integer number (243000).

Almost surely, 2^3221813 is an apocalyptic number.

It is an amenable number.

3221813 is a deficient number, since it is larger than the sum of its proper divisors (666187).

3221813 is a wasteful number, since it uses less digits than its factorization.

3221813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364.

The product of its digits is 288, while the sum is 20.

The square root of 3221813 is about 1794.9409461038. The cubic root of 3221813 is about 147.6953344245.

The spelling of 3221813 in words is "three million, two hundred twenty-one thousand, eight hundred thirteen".