3213421 has 2 divisors, whose sum is σ = 3213422. Its totient is φ = 3213420.

The previous prime is 3213401. The next prime is 3213439. The reversal of 3213421 is 1243123.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2937796 + 275625 = 1714^2 + 525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3213421 is a prime.

3213421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3213395 and 3213404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3213401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1606710 + 1606711.

It is an arithmetic number, because the mean of its divisors is an integer number (1606711).

Almost surely, 2^3213421 is an apocalyptic number.

It is an amenable number.

3213421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3213421 is an equidigital number, since it uses as much as digits as its factorization.

3213421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 16.

The square root of 3213421 is about 1792.6017404878. The cubic root of 3213421 is about 147.5669867142.

Adding to 3213421 its reverse (1243123), we get a palindrome (4456544).

The spelling of 3213421 in words is "three million, two hundred thirteen thousand, four hundred twenty-one".