12281921 has 8 divisors (see below), whose sum is σ = 12768000. Its totient is φ = 11801520.

The previous prime is 12281909. The next prime is 12281947. The reversal of 12281921 is 12918221.

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 12281921 - 2²² = 8087617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12281981) 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, 3290 + ... + 5948.

It is an arithmetic number, because the mean of its divisors is an integer number (1596000).

Almost surely, 2^12281921 is an apocalyptic number.

It is an amenable number.

12281921 is a deficient number, since it is larger than the sum of its proper divisors (486079).

12281921 is a wasteful number, since it uses less digits than its factorization.

12281921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2839.

The product of its digits is 576, while the sum is 26.

The square root of 12281921 is about 3504.5571760210. The cubic root of 12281921 is about 230.7218718685.

The spelling of 12281921 in words is "twelve million, two hundred eighty-one thousand, nine hundred twenty-one".