12421001 has 4 divisors (see below), whose sum is σ = 12428052. Its totient is φ = 12413952.

The previous prime is 12420979. The next prime is 12421007. The reversal of 12421001 is 10012421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10012421 = 43 ⋅232847.

It can be written as a sum of positive squares in 2 ways, for example, as 1537600 + 10883401 = 1240^2 + 3299^2 .

It is a cyclic number.

It is not a de Polignac number, because 12421001 - 2²² = 8226697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12421007) 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, 1661 + ... + 5253.

It is an arithmetic number, because the mean of its divisors is an integer number (3107013).

Almost surely, 2^12421001 is an apocalyptic number.

It is an amenable number.

12421001 is a deficient number, since it is larger than the sum of its proper divisors (7051).

12421001 is an equidigital number, since it uses as much as digits as its factorization.

12421001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7050.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 12421001 is about 3524.3440524444. The cubic root of 12421001 is about 231.5895002613.

Adding to 12421001 its reverse (10012421), we get a palindrome (22433422).

The spelling of 12421001 in words is "twelve million, four hundred twenty-one thousand, one".