12240343210421 has 2 divisors, whose sum is σ = 12240343210422. Its totient is φ = 12240343210420.

The previous prime is 12240343210393. The next prime is 12240343210439. The reversal of 12240343210421 is 12401234304221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7281308592100 + 4959034618321 = 2698390^2 + 2226889^2 .

It is a cyclic number.

It is not a de Polignac number, because 12240343210421 - 2³⁰ = 12239269468597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12240343210481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6120171605210 + 6120171605211.

It is an arithmetic number, because the mean of its divisors is an integer number (6120171605211).

Almost surely, 2^{12240343210421} is an apocalyptic number.

It is an amenable number.

12240343210421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12240343210421 is an equidigital number, since it uses as much as digits as its factorization.

12240343210421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 12240343210421 its reverse (12401234304221), we get a palindrome (24641577514642).

The spelling of 12240343210421 in words is "twelve trillion, two hundred forty billion, three hundred forty-three million, two hundred ten thousand, four hundred twenty-one".