12424511821 has 2 divisors, whose sum is σ = 12424511822. Its totient is φ = 12424511820.

The previous prime is 12424511809. The next prime is 12424511849. The reversal of 12424511821 is 12811542421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11758149225 + 666362596 = 108435^2 + 25814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12424511821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12424511851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6212255910 + 6212255911.

It is an arithmetic number, because the mean of its divisors is an integer number (6212255911).

Almost surely, 2^12424511821 is an apocalyptic number.

It is an amenable number.

12424511821 is a deficient number, since it is larger than the sum of its proper divisors (1).

12424511821 is an equidigital number, since it uses as much as digits as its factorization.

12424511821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5120, while the sum is 31.

The spelling of 12424511821 in words is "twelve billion, four hundred twenty-four million, five hundred eleven thousand, eight hundred twenty-one".