12814646821 has 2 divisors, whose sum is σ = 12814646822. Its totient is φ = 12814646820.

The previous prime is 12814646783. The next prime is 12814646827. The reversal of 12814646821 is 12864641821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8337698721 + 4476948100 = 91311^2 + 66910^2 .

It is a cyclic number.

It is not a de Polignac number, because 12814646821 - 2³³ = 4224712229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12814646827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6407323410 + 6407323411.

It is an arithmetic number, because the mean of its divisors is an integer number (6407323411).

Almost surely, 2^12814646821 is an apocalyptic number.

It is an amenable number.

12814646821 is a deficient number, since it is larger than the sum of its proper divisors (1).

12814646821 is an equidigital number, since it uses as much as digits as its factorization.

12814646821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147456, while the sum is 43.

Subtracting 12814646821 from its reverse (12864641821), we obtain a triangular number (49995000 = T₉₉₉₉).

The spelling of 12814646821 in words is "twelve billion, eight hundred fourteen million, six hundred forty-six thousand, eight hundred twenty-one".