3216421 has 8 divisors (see below), whose sum is σ = 3478104. Its totient is φ = 2956800.

The previous prime is 3216413. The next prime is 3216431. The reversal of 3216421 is 1246123.

It can be written as a sum of positive squares in 4 ways, for example, as 171396 + 3045025 = 414^2 + 1745^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3216421 - 2³ = 3216413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3216431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4905 + ... + 5521.

It is an arithmetic number, because the mean of its divisors is an integer number (434763).

Almost surely, 2^3216421 is an apocalyptic number.

It is an amenable number.

3216421 is a deficient number, since it is larger than the sum of its proper divisors (261683).

3216421 is a wasteful number, since it uses less digits than its factorization.

3216421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031.

The product of its digits is 288, while the sum is 19.

The square root of 3216421 is about 1793.4383178688. The cubic root of 3216421 is about 147.6128945142.

The spelling of 3216421 in words is "three million, two hundred sixteen thousand, four hundred twenty-one".