3201021 has 6 divisors (see below), whose sum is σ = 4623710. Its totient is φ = 2134008.

The previous prime is 3201007. The next prime is 3201043. The reversal of 3201021 is 1201023.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3132900 + 68121 = 1770^2 + 261^2 .

It is not a de Polignac number, because 3201021 - 2¹⁰ = 3199997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 355669 = 3201021 / (3 + 2 + 0 + 1 + 0 + 2 + 1).

It is a Duffinian number.

3201021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3200994 and 3201012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3201421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 177826 + ... + 177843.

Almost surely, 2^3201021 is an apocalyptic number.

It is an amenable number.

3201021 is a deficient number, since it is larger than the sum of its proper divisors (1422689).

3201021 is a wasteful number, since it uses less digits than its factorization.

3201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355675 (or 355672 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 3201021 is about 1789.1397374157. The cubic root of 3201021 is about 147.3769307631.

Adding to 3201021 its reverse (1201023), we get a palindrome (4402044).

The spelling of 3201021 in words is "three million, two hundred one thousand, twenty-one".