3221421 has 16 divisors (see below), whose sum is σ = 4950528. Its totient is φ = 1825200.

The previous prime is 3221419. The next prime is 3221423. The reversal of 3221421 is 1241223.

It is an interprime number because it is at equal distance from previous prime (3221419) and next prime (3221423).

It is not a de Polignac number, because 3221421 - 2¹ = 3221419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3221421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3221423) 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, 2166 + ... + 3336.

It is an arithmetic number, because the mean of its divisors is an integer number (309408).

Almost surely, 2^3221421 is an apocalyptic number.

It is an amenable number.

3221421 is a deficient number, since it is larger than the sum of its proper divisors (1729107).

3221421 is a wasteful number, since it uses less digits than its factorization.

3221421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312.

The product of its digits is 96, while the sum is 15.

The square root of 3221421 is about 1794.8317469891. The cubic root of 3221421 is about 147.6893441204.

Adding to 3221421 its reverse (1241223), we get a palindrome (4462644).

The spelling of 3221421 in words is "three million, two hundred twenty-one thousand, four hundred twenty-one".