12032821 has 4 divisors (see below), whose sum is σ = 12740652. Its totient is φ = 11324992.

The previous prime is 12032789. The next prime is 12032827. The reversal of 12032821 is 12823021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10329796 + 1703025 = 3214^2 + 1305^2 .

It is not a de Polignac number, because 12032821 - 2⁵ = 12032789 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 (12032827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353890 + ... + 353923.

It is an arithmetic number, because the mean of its divisors is an integer number (3185163).

Almost surely, 2^12032821 is an apocalyptic number.

It is an amenable number.

12032821 is a deficient number, since it is larger than the sum of its proper divisors (707831).

12032821 is an equidigital number, since it uses as much as digits as its factorization.

12032821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707830.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 12032821 is about 3468.8356836264. The cubic root of 12032821 is about 229.1513844281.

Adding to 12032821 its reverse (12823021), we get a palindrome (24855842).

The spelling of 12032821 in words is "twelve million, thirty-two thousand, eight hundred twenty-one".