12442533021 has 24 divisors (see below), whose sum is σ = 18966228320. Its totient is φ = 7838604576.

The previous prime is 12442533007. The next prime is 12442533029. The reversal of 12442533021 is 12033524421.

12442533021 is a `hidden beast` number, since 124 + 4 + 2 + 533 + 0 + 2 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-12442533021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12442533029) 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, 23755 + ... + 159528.

Almost surely, 2^12442533021 is an apocalyptic number.

It is an amenable number.

12442533021 is a deficient number, since it is larger than the sum of its proper divisors (6523695299).

12442533021 is a wasteful number, since it uses less digits than its factorization.

12442533021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183705 (or 183702 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The spelling of 12442533021 in words is "twelve billion, four hundred forty-two million, five hundred thirty-three thousand, twenty-one".