12122861 has 4 divisors (see below), whose sum is σ = 12404832. Its totient is φ = 11840892.

The previous prime is 12122857. The next prime is 12122867. The reversal of 12122861 is 16822121.

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 a cyclic number.

It is not a de Polignac number, because 12122861 - 2² = 12122857 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 (12122867) 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, 140921 + ... + 141006.

It is an arithmetic number, because the mean of its divisors is an integer number (3101208).

Almost surely, 2^12122861 is an apocalyptic number.

It is an amenable number.

12122861 is a deficient number, since it is larger than the sum of its proper divisors (281971).

12122861 is an equidigital number, since it uses as much as digits as its factorization.

12122861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281970.

The product of its digits is 384, while the sum is 23.

The square root of 12122861 is about 3481.7899132486. The cubic root of 12122861 is about 229.7215344479.

Adding to 12122861 its reverse (16822121), we get a palindrome (28944982).

The spelling of 12122861 in words is "twelve million, one hundred twenty-two thousand, eight hundred sixty-one".