12421571 has 4 divisors (see below), whose sum is σ = 12443112. Its totient is φ = 12400032.

The previous prime is 12421567. The next prime is 12421579. The reversal of 12421571 is 17512421.

12421571 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.

It is a cyclic number.

It is not a de Polignac number, because 12421571 - 2² = 12421567 is a prime.

It is a super-2 number, since 2×12421571² = 308590852216082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12421579) 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, 9881 + ... + 11066.

It is an arithmetic number, because the mean of its divisors is an integer number (3110778).

Almost surely, 2^12421571 is an apocalyptic number.

12421571 is a deficient number, since it is larger than the sum of its proper divisors (21541).

12421571 is an equidigital number, since it uses as much as digits as its factorization.

12421571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21540.

The product of its digits is 560, while the sum is 23.

The square root of 12421571 is about 3524.4249176284. The cubic root of 12421571 is about 231.5930427561.

Adding to 12421571 its reverse (17512421), we get a palindrome (29933992).

The spelling of 12421571 in words is "twelve million, four hundred twenty-one thousand, five hundred seventy-one".