12271421 has 2 divisors, whose sum is σ = 12271422. Its totient is φ = 12271420.

The previous prime is 12271417. The next prime is 12271429. The reversal of 12271421 is 12417221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10272025 + 1999396 = 3205^2 + 1414^2 .

It is a cyclic number.

It is not a de Polignac number, because 12271421 - 2² = 12271417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12271393 and 12271402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12271429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6135710 + 6135711.

It is an arithmetic number, because the mean of its divisors is an integer number (6135711).

Almost surely, 2^12271421 is an apocalyptic number.

It is an amenable number.

12271421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12271421 is an equidigital number, since it uses as much as digits as its factorization.

12271421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 224, while the sum is 20.

The square root of 12271421 is about 3503.0588062435. The cubic root of 12271421 is about 230.6561039171.

Adding to 12271421 its reverse (12417221), we get a palindrome (24688642).

The spelling of 12271421 in words is "twelve million, two hundred seventy-one thousand, four hundred twenty-one".