3421 has 4 divisors (see below), whose sum is σ = 3744. Its totient is φ = 3100.

The previous prime is 3413. The next prime is 3433. The reversal of 3421 is 1243.

3421 is nontrivially palindromic in base 16.

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: 1243 = 11 ⋅113.

It is a cyclic number.

It is not a de Polignac number, because 3421 - 2³ = 3413 is a prime.

It is a Duffinian number.

3421 is an undulating number in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 3398 and 3407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3461) 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, 145 + ... + 166.

It is an arithmetic number, because the mean of its divisors is an integer number (936).

2³⁴²¹ is an apocalyptic number.

It is an amenable number.

3421 is a deficient number, since it is larger than the sum of its proper divisors (323).

3421 is a wasteful number, since it uses less digits than its factorization.

3421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322.

The product of its digits is 24, while the sum is 10.

The square root of 3421 is about 58.4893152636. The cubic root of 3421 is about 15.0678408601.

Adding to 3421 its reverse (1243), we get a palindrome (4664).

It can be divided in two parts, 342 and 1, that added together give a palindrome (343).

The spelling of 3421 in words is "three thousand, four hundred twenty-one", and thus it is an iban number.