12204240421 has 2 divisors, whose sum is σ = 12204240422. Its totient is φ = 12204240420.

The previous prime is 12204240397. The next prime is 12204240431. The reversal of 12204240421 is 12404240221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12163663521 + 40576900 = 110289^2 + 6370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12204240421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12204240392 and 12204240401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12204240431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6102120210 + 6102120211.

It is an arithmetic number, because the mean of its divisors is an integer number (6102120211).

Almost surely, 2^12204240421 is an apocalyptic number.

It is an amenable number.

12204240421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12204240421 is an equidigital number, since it uses as much as digits as its factorization.

12204240421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 12204240421 its reverse (12404240221), we get a palindrome (24608480642).

The spelling of 12204240421 in words is "twelve billion, two hundred four million, two hundred forty thousand, four hundred twenty-one".