12820244639 has 2 divisors, whose sum is σ = 12820244640. Its totient is φ = 12820244638.

The previous prime is 12820244621. The next prime is 12820244641. The reversal of 12820244639 is 93644202821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12820244639 - 2¹⁶ = 12820179103 is a prime.

It is a Sophie Germain prime.

Together with 12820244641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12820244596 and 12820244605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12820244609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6410122319 + 6410122320.

It is an arithmetic number, because the mean of its divisors is an integer number (6410122320).

Almost surely, 2^12820244639 is an apocalyptic number.

12820244639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12820244639 is an equidigital number, since it uses as much as digits as its factorization.

12820244639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 12820244639 in words is "twelve billion, eight hundred twenty million, two hundred forty-four thousand, six hundred thirty-nine".