12421861399 has 2 divisors, whose sum is σ = 12421861400. Its totient is φ = 12421861398.

The previous prime is 12421861369. The next prime is 12421861409. The reversal of 12421861399 is 99316812421.

It is a strong prime.

It is an emirp because it is prime and its reverse (99316812421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12421861399 - 2¹⁷ = 12421730327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12421861369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210930699 + 6210930700.

It is an arithmetic number, because the mean of its divisors is an integer number (6210930700).

Almost surely, 2^12421861399 is an apocalyptic number.

12421861399 is a deficient number, since it is larger than the sum of its proper divisors (1).

12421861399 is an equidigital number, since it uses as much as digits as its factorization.

12421861399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The spelling of 12421861399 in words is "twelve billion, four hundred twenty-one million, eight hundred sixty-one thousand, three hundred ninety-nine".