3221021 has 4 divisors (see below), whose sum is σ = 3251232. Its totient is φ = 3190812.

The previous prime is 3221017. The next prime is 3221033. The reversal of 3221021 is 1201223.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1201223 = 211 ⋅5693.

It is a cyclic number.

It is not a de Polignac number, because 3221021 - 2² = 3221017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3220993 and 3221011.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14945 + ... + 15158.

It is an arithmetic number, because the mean of its divisors is an integer number (812808).

Almost surely, 2^3221021 is an apocalyptic number.

It is an amenable number.

3221021 is a deficient number, since it is larger than the sum of its proper divisors (30211).

3221021 is a wasteful number, since it uses less digits than its factorization.

3221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30210.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 3221021 is about 1794.7203124721. The cubic root of 3221021 is about 147.6832310642.

Adding to 3221021 its reverse (1201223), we get a palindrome (4422244).

The spelling of 3221021 in words is "three million, two hundred twenty-one thousand, twenty-one".