12123571 has 2 divisors, whose sum is σ = 12123572. Its totient is φ = 12123570.

The previous prime is 12123569. The next prime is 12123589. The reversal of 12123571 is 17532121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12123571 - 2¹ = 12123569 is a prime.

Together with 12123569, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12123521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061785 + 6061786.

It is an arithmetic number, because the mean of its divisors is an integer number (6061786).

Almost surely, 2^12123571 is an apocalyptic number.

12123571 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123571 is an equidigital number, since it uses as much as digits as its factorization.

12123571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 22.

The square root of 12123571 is about 3481.8918708082. The cubic root of 12123571 is about 229.7260190632.

Adding to 12123571 its reverse (17532121), we get a palindrome (29655692).

The spelling of 12123571 in words is "twelve million, one hundred twenty-three thousand, five hundred seventy-one".