3420221 has 4 divisors (see below), whose sum is σ = 3908832. Its totient is φ = 2931612.

The previous prime is 3420211. The next prime is 3420227. The reversal of 3420221 is 1220243.

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 3420221 - 2¹⁰ = 3419197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3420196 and 3420205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3420227) 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, 244295 + ... + 244308.

It is an arithmetic number, because the mean of its divisors is an integer number (977208).

Almost surely, 2^3420221 is an apocalyptic number.

It is an amenable number.

3420221 is a deficient number, since it is larger than the sum of its proper divisors (488611).

3420221 is an equidigital number, since it uses as much as digits as its factorization.

3420221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488610.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 3420221 is about 1849.3839514822. The cubic root of 3420221 is about 150.6669706792. Note that the first 3 decimals are identical.

Adding to 3420221 its reverse (1220243), we get a palindrome (4640464).

The spelling of 3420221 in words is "three million, four hundred twenty thousand, two hundred twenty-one".