12444021 has 12 divisors (see below), whose sum is σ = 18008640. Its totient is φ = 8280360.

The previous prime is 12444011. The next prime is 12444023. The reversal of 12444021 is 12044421.

It is a de Polignac number, because none of the positive numbers 2^k-12444021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12443985 and 12444003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12444023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5716 + ... + 7586.

It is an arithmetic number, because the mean of its divisors is an integer number (1500720).

Almost surely, 2^12444021 is an apocalyptic number.

It is an amenable number.

12444021 is a deficient number, since it is larger than the sum of its proper divisors (5564619).

12444021 is a wasteful number, since it uses less digits than its factorization.

12444021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2616 (or 2613 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 12444021 is about 3527.6083966336. The cubic root of 12444021 is about 231.7324812290.

Adding to 12444021 its reverse (12044421), we get a palindrome (24488442).

The spelling of 12444021 in words is "twelve million, four hundred forty-four thousand, twenty-one".