13233821 has 4 divisors (see below), whose sum is σ = 13242432. Its totient is φ = 13225212.

The previous prime is 13233811. The next prime is 13233833. The reversal of 13233821 is 12833231.

13233821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12833231 = 211 ⋅60821.

It is a cyclic number.

It is not a de Polignac number, because 13233821 - 2⁶ = 13233757 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 (13233811) 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, 1301 + ... + 5306.

It is an arithmetic number, because the mean of its divisors is an integer number (3310608).

Almost surely, 2^13233821 is an apocalyptic number.

It is an amenable number.

13233821 is a deficient number, since it is larger than the sum of its proper divisors (8611).

13233821 is an equidigital number, since it uses as much as digits as its factorization.

13233821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8610.

The product of its digits is 864, while the sum is 23.

The square root of 13233821 is about 3637.8319092558. The cubic root of 13233821 is about 236.5348219774.

The spelling of 13233821 in words is "thirteen million, two hundred thirty-three thousand, eight hundred twenty-one".