12864021 has 8 divisors (see below), whose sum is σ = 17171520. Its totient is φ = 8566272.

The previous prime is 12864013. The next prime is 12864031. The reversal of 12864021 is 12046821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12864021 - 2³ = 12864013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12863982 and 12864000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12864031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1600 + ... + 5318.

It is an arithmetic number, because the mean of its divisors is an integer number (2146440).

Almost surely, 2^12864021 is an apocalyptic number.

It is an amenable number.

12864021 is a deficient number, since it is larger than the sum of its proper divisors (4307499).

12864021 is a wasteful number, since it uses less digits than its factorization.

12864021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4875.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 12864021 is about 3586.6448109619. The cubic root of 12864021 is about 234.3107676071.

The spelling of 12864021 in words is "twelve million, eight hundred sixty-four thousand, twenty-one".