12208421 has 2 divisors, whose sum is σ = 12208422. Its totient is φ = 12208420.

The previous prime is 12208411. The next prime is 12208429. The reversal of 12208421 is 12480221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6964321 + 5244100 = 2639^2 + 2290^2 .

It is a cyclic number.

It is not a de Polignac number, because 12208421 - 2²² = 8014117 is a prime.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 12208393 and 12208402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12208429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6104210 + 6104211.

It is an arithmetic number, because the mean of its divisors is an integer number (6104211).

Almost surely, 2^12208421 is an apocalyptic number.

It is an amenable number.

12208421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12208421 is an equidigital number, since it uses as much as digits as its factorization.

12208421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 12208421 is about 3494.0550940133. The cubic root of 12208421 is about 230.2607062667.

Adding to 12208421 its reverse (12480221), we get a palindrome (24688642).

It can be divided in two parts, 12 and 208421, that multiplied together give a palindrome (2501052).

The spelling of 12208421 in words is "twelve million, two hundred eight thousand, four hundred twenty-one".