12133521 has 24 divisors (see below), whose sum is σ = 18258240. Its totient is φ = 7757856.

The previous prime is 12133519. The next prime is 12133523. The reversal of 12133521 is 12533121.

12133521 is a `hidden beast` number, since 12 + 133 + 521 = 666.

It is an interprime number because it is at equal distance from previous prime (12133519) and next prime (12133523).

It is not a de Polignac number, because 12133521 - 2¹ = 12133519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12133494 and 12133503.

It is not an unprimeable number, because it can be changed into a prime (12133523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27420 + ... + 27858.

It is an arithmetic number, because the mean of its divisors is an integer number (760760).

Almost surely, 2^12133521 is an apocalyptic number.

It is an amenable number.

12133521 is a deficient number, since it is larger than the sum of its proper divisors (6124719).

12133521 is a wasteful number, since it uses less digits than its factorization.

12133521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565 (or 562 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 12133521 is about 3483.3203987001. The cubic root of 12133521 is about 229.7888484296.

Adding to 12133521 its reverse (12533121), we get a palindrome (24666642).

The spelling of 12133521 in words is "twelve million, one hundred thirty-three thousand, five hundred twenty-one".