3261821 has 4 divisors (see below), whose sum is σ = 3276672. Its totient is φ = 3246972.

The previous prime is 3261803. The next prime is 3261827. The reversal of 3261821 is 1281623.

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: 1281623 = 7 ⋅183089.

It is a cyclic number.

It is not a de Polignac number, because 3261821 - 2¹⁸ = 2999677 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 (3261827) 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, 7091 + ... + 7536.

It is an arithmetic number, because the mean of its divisors is an integer number (819168).

Almost surely, 2^3261821 is an apocalyptic number.

It is an amenable number.

3261821 is a deficient number, since it is larger than the sum of its proper divisors (14851).

3261821 is a wasteful number, since it uses less digits than its factorization.

3261821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14850.

The product of its digits is 576, while the sum is 23.

The square root of 3261821 is about 1806.0512174354. The cubic root of 3261821 is about 148.3041741558.

The spelling of 3261821 in words is "three million, two hundred sixty-one thousand, eight hundred twenty-one".