3215221 has 4 divisors (see below), whose sum is σ = 3256000. Its totient is φ = 3174444.

The previous prime is 3215213. The next prime is 3215231. The reversal of 3215221 is 1225123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3215221 - 2³ = 3215213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3215195 and 3215204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3215231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20271 + ... + 20428.

It is an arithmetic number, because the mean of its divisors is an integer number (814000).

Almost surely, 2^3215221 is an apocalyptic number.

It is an amenable number.

3215221 is a deficient number, since it is larger than the sum of its proper divisors (40779).

3215221 is an equidigital number, since it uses as much as digits as its factorization.

3215221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40778.

The product of its digits is 120, while the sum is 16.

The square root of 3215221 is about 1793.1037337533. The cubic root of 3215221 is about 147.5945348211.

The spelling of 3215221 in words is "three million, two hundred fifteen thousand, two hundred twenty-one".