12123971 has 4 divisors (see below), whose sum is σ = 12185712. Its totient is φ = 12062232.

The previous prime is 12123959. The next prime is 12123977. The reversal of 12123971 is 17932121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17932121 = 29 ⋅618349.

It is a cyclic number.

It is not a de Polignac number, because 12123971 - 2¹⁸ = 11861827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12123971.

It is not an unprimeable number, because it can be changed into a prime (12123977) 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, 30575 + ... + 30968.

It is an arithmetic number, because the mean of its divisors is an integer number (3046428).

Almost surely, 2^12123971 is an apocalyptic number.

12123971 is a deficient number, since it is larger than the sum of its proper divisors (61741).

12123971 is an equidigital number, since it uses as much as digits as its factorization.

12123971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61740.

The product of its digits is 756, while the sum is 26.

The square root of 12123971 is about 3481.9493103720. The cubic root of 12123971 is about 229.7285455300.

The spelling of 12123971 in words is "twelve million, one hundred twenty-three thousand, nine hundred seventy-one".