12533021 has 4 divisors (see below), whose sum is σ = 12937344. Its totient is φ = 12128700.

The previous prime is 12533009. The next prime is 12533023. The reversal of 12533021 is 12033521.

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: 12033521 = 29 ⋅414949.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12533021 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 (12533023) 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, 202115 + ... + 202176.

It is an arithmetic number, because the mean of its divisors is an integer number (3234336).

Almost surely, 2^12533021 is an apocalyptic number.

It is an amenable number.

12533021 is a deficient number, since it is larger than the sum of its proper divisors (404323).

12533021 is an equidigital number, since it uses as much as digits as its factorization.

12533021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404322.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 12533021 is about 3540.2007005253. The cubic root of 12533021 is about 232.2836218663.

Adding to 12533021 its reverse (12033521), we get a palindrome (24566542).

Subtracting from 12533021 its reverse (12033521), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 12533021 in words is "twelve million, five hundred thirty-three thousand, twenty-one".