12421121 has 2 divisors, whose sum is σ = 12421122. Its totient is φ = 12421120.

The previous prime is 12421103. The next prime is 12421163. The reversal of 12421121 is 12112421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8673025 + 3748096 = 2945^2 + 1936^2 .

It is a cyclic number.

It is not a de Polignac number, because 12421121 - 2¹⁰ = 12420097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12421096 and 12421105.

It is not a weakly prime, because it can be changed into another prime (12421021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210560 + 6210561.

It is an arithmetic number, because the mean of its divisors is an integer number (6210561).

Almost surely, 2^12421121 is an apocalyptic number.

It is an amenable number.

12421121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12421121 is an equidigital number, since it uses as much as digits as its factorization.

12421121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32, while the sum is 14.

The square root of 12421121 is about 3524.3610768478. The cubic root of 12421121 is about 231.5902460587.

Adding to 12421121 its reverse (12112421), we get a palindrome (24533542).

The spelling of 12421121 in words is "twelve million, four hundred twenty-one thousand, one hundred twenty-one".