8126221013 has 2 divisors, whose sum is σ = 8126221014. Its totient is φ = 8126221012.

The previous prime is 8126220997. The next prime is 8126221031. The reversal of 8126221013 is 3101226218.

Together with next prime (8126221031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5861127364 + 2265093649 = 76558^2 + 47593^2 .

It is a cyclic number.

It is not a de Polignac number, because 8126221013 - 2⁴ = 8126220997 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8126221073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4063110506 + 4063110507.

It is an arithmetic number, because the mean of its divisors is an integer number (4063110507).

Almost surely, 2^8126221013 is an apocalyptic number.

It is an amenable number.

8126221013 is a deficient number, since it is larger than the sum of its proper divisors (1).

8126221013 is an equidigital number, since it uses as much as digits as its factorization.

8126221013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 8126221013 is about 90145.5545936681. The cubic root of 8126221013 is about 2010.4635790385.

The spelling of 8126221013 in words is "eight billion, one hundred twenty-six million, two hundred twenty-one thousand, thirteen".