12421057 has 4 divisors (see below), whose sum is σ = 13550256. Its totient is φ = 11291860.

The previous prime is 12421051. The next prime is 12421061. The reversal of 12421057 is 75012421.

It is a happy number.

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 12421057 - 2¹¹ = 12419009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12421051) 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, 564583 + ... + 564604.

It is an arithmetic number, because the mean of its divisors is an integer number (3387564).

Almost surely, 2^12421057 is an apocalyptic number.

It is an amenable number.

12421057 is a deficient number, since it is larger than the sum of its proper divisors (1129199).

12421057 is a wasteful number, since it uses less digits than its factorization.

12421057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129198.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 12421057 is about 3524.3519971762. The cubic root of 12421057 is about 231.5898483007.

Adding to 12421057 its reverse (75012421), we get a palindrome (87433478).

The spelling of 12421057 in words is "twelve million, four hundred twenty-one thousand, fifty-seven".