3205021 has 4 divisors (see below), whose sum is σ = 3212352. Its totient is φ = 3197692.

The previous prime is 3205009. The next prime is 3205039. The reversal of 3205021 is 1205023.

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: 1205023 = 769 ⋅1567.

It is a cyclic number.

It is not a de Polignac number, because 3205021 - 2⁷ = 3204893 is a prime.

It is a super-2 number, since 2×3205021² = 20544319220882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3204992 and 3205010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3208021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2965 + ... + 3898.

It is an arithmetic number, because the mean of its divisors is an integer number (803088).

Almost surely, 2^3205021 is an apocalyptic number.

It is an amenable number.

3205021 is a deficient number, since it is larger than the sum of its proper divisors (7331).

3205021 is an equidigital number, since it uses as much as digits as its factorization.

3205021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7330.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 3205021 is about 1790.2572440853. The cubic root of 3205021 is about 147.4382926789.

The spelling of 3205021 in words is "three million, two hundred five thousand, twenty-one".