3217421 has 2 divisors, whose sum is σ = 3217422. Its totient is φ = 3217420.

The previous prime is 3217399. The next prime is 3217429. The reversal of 3217421 is 1247123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3200521 + 16900 = 1789^2 + 130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3217421 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3217393 and 3217402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3217429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1608710 + 1608711.

It is an arithmetic number, because the mean of its divisors is an integer number (1608711).

Almost surely, 2^3217421 is an apocalyptic number.

It is an amenable number.

3217421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3217421 is an equidigital number, since it uses as much as digits as its factorization.

3217421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 20.

The square root of 3217421 is about 1793.7170902904. The cubic root of 3217421 is about 147.6281907704.

The spelling of 3217421 in words is "three million, two hundred seventeen thousand, four hundred twenty-one".