12831315821 has 2 divisors, whose sum is σ = 12831315822. Its totient is φ = 12831315820.

The previous prime is 12831315797. The next prime is 12831315823. The reversal of 12831315821 is 12851313821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11169530596 + 1661785225 = 105686^2 + 40765^2 .

It is a cyclic number.

It is not a de Polignac number, because 12831315821 - 2²⁶ = 12764206957 is a prime.

Together with 12831315823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12831315823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6415657910 + 6415657911.

It is an arithmetic number, because the mean of its divisors is an integer number (6415657911).

Almost surely, 2^12831315821 is an apocalyptic number.

It is an amenable number.

12831315821 is a deficient number, since it is larger than the sum of its proper divisors (1).

12831315821 is an equidigital number, since it uses as much as digits as its factorization.

12831315821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 35.

The spelling of 12831315821 in words is "twelve billion, eight hundred thirty-one million, three hundred fifteen thousand, eight hundred twenty-one".