12120861 has 4 divisors (see below), whose sum is σ = 16161152. Its totient is φ = 8080572.

The previous prime is 12120859. The next prime is 12120863. The reversal of 12120861 is 16802121.

12120861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 (12120859) and next prime (12120863).

It is not a de Polignac number, because 12120861 - 2¹ = 12120859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2020141 + ... + 2020146.

It is an arithmetic number, because the mean of its divisors is an integer number (4040288).

Almost surely, 2^12120861 is an apocalyptic number.

It is an amenable number.

12120861 is a deficient number, since it is larger than the sum of its proper divisors (4040291).

12120861 is an equidigital number, since it uses as much as digits as its factorization.

12120861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040290.

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

The square root of 12120861 is about 3481.5026928038. The cubic root of 12120861 is about 229.7089007872.

Adding to 12120861 its reverse (16802121), we get a palindrome (28922982).

The spelling of 12120861 in words is "twelve million, one hundred twenty thousand, eight hundred sixty-one".