12256121 has 8 divisors (see below), whose sum is σ = 12934080. Its totient is φ = 11581488.

The previous prime is 12256117. The next prime is 12256147. The reversal of 12256121 is 12165221.

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

It is not a de Polignac number, because 12256121 - 2² = 12256117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12256093 and 12256102.

It is not an unprimeable number, because it can be changed into a prime (12256151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11795 + ... + 12791.

It is an arithmetic number, because the mean of its divisors is an integer number (1616760).

Almost surely, 2^12256121 is an apocalyptic number.

It is an amenable number.

12256121 is a deficient number, since it is larger than the sum of its proper divisors (677959).

12256121 is an equidigital number, since it uses as much as digits as its factorization.

12256121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663.

The product of its digits is 240, while the sum is 20.

The square root of 12256121 is about 3500.8743193665. The cubic root of 12256121 is about 230.5602034213.

The spelling of 12256121 in words is "twelve million, two hundred fifty-six thousand, one hundred twenty-one".