12120681 has 4 divisors (see below), whose sum is σ = 16160912. Its totient is φ = 8080452.

The previous prime is 12120679. The next prime is 12120683. The reversal of 12120681 is 18602121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (12120679) and next prime (12120683).

It is not a de Polignac number, because 12120681 - 2¹ = 12120679 is a prime.

It is a super-4 number, since 4×12120681⁴ (a number of 29 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12120683) 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 3 ways as a sum of consecutive naturals, for example, 2020111 + ... + 2020116.

It is an arithmetic number, because the mean of its divisors is an integer number (4040228).

Almost surely, 2^12120681 is an apocalyptic number.

It is an amenable number.

12120681 is a deficient number, since it is larger than the sum of its proper divisors (4040231).

12120681 is an equidigital number, since it uses as much as digits as its factorization.

12120681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4040230.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 12120681 is about 3481.4768418015. The cubic root of 12120681 is about 229.7077636896.

It can be divided in two parts, 121 and 20681, that added together give a palindrome (20802).

The spelling of 12120681 in words is "twelve million, one hundred twenty thousand, six hundred eighty-one".