12643121 has 8 divisors (see below), whose sum is σ = 13444704. Its totient is φ = 11848000.

The previous prime is 12643117. The next prime is 12643177. The reversal of 12643121 is 12134621.

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

It is a cyclic number.

It is not a de Polignac number, because 12643121 - 2² = 12643117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12643093 and 12643102.

It is not an unprimeable number, because it can be changed into a prime (12643021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2786 + ... + 5748.

It is an arithmetic number, because the mean of its divisors is an integer number (1680588).

Almost surely, 2^12643121 is an apocalyptic number.

It is an amenable number.

12643121 is a deficient number, since it is larger than the sum of its proper divisors (801583).

12643121 is a wasteful number, since it uses less digits than its factorization.

12643121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3231.

The product of its digits is 288, while the sum is 20.

The square root of 12643121 is about 3555.7166647527. The cubic root of 12643121 is about 232.9618276356.

Adding to 12643121 its reverse (12134621), we get a palindrome (24777742).

The spelling of 12643121 in words is "twelve million, six hundred forty-three thousand, one hundred twenty-one".