12421337 has 4 divisors (see below), whose sum is σ = 12438180. Its totient is φ = 12404496.

The previous prime is 12421333. The next prime is 12421349. The reversal of 12421337 is 73312421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1819801 + 10601536 = 1349^2 + 3256^2 .

It is a cyclic number.

It is not a de Polignac number, because 12421337 - 2² = 12421333 is a prime.

It is a super-2 number, since 2×12421337² = 308579225735138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12421333) 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, 7262 + ... + 8807.

It is an arithmetic number, because the mean of its divisors is an integer number (3109545).

Almost surely, 2^12421337 is an apocalyptic number.

It is an amenable number.

12421337 is a deficient number, since it is larger than the sum of its proper divisors (16843).

12421337 is an equidigital number, since it uses as much as digits as its factorization.

12421337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16842.

The product of its digits is 1008, while the sum is 23.

The square root of 12421337 is about 3524.3917205668. The cubic root of 12421337 is about 231.5915884819.

Adding to 12421337 its reverse (73312421), we get a palindrome (85733758).

The spelling of 12421337 in words is "twelve million, four hundred twenty-one thousand, three hundred thirty-seven".