21826452913 has 2 divisors, whose sum is σ = 21826452914. Its totient is φ = 21826452912.

The previous prime is 21826452911. The next prime is 21826452917. The reversal of 21826452913 is 31925462812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16787866624 + 5038586289 = 129568^2 + 70983^2 .

It is a cyclic number.

It is not a de Polignac number, because 21826452913 - 2¹ = 21826452911 is a prime.

Together with 21826452911, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21826452913.

It is not a weakly prime, because it can be changed into another prime (21826452911) 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, 10913226456 + 10913226457.

It is an arithmetic number, because the mean of its divisors is an integer number (10913226457).

Almost surely, 2^21826452913 is an apocalyptic number.

It is an amenable number.

21826452913 is a deficient number, since it is larger than the sum of its proper divisors (1).

21826452913 is an equidigital number, since it uses as much as digits as its factorization.

21826452913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 43.

The spelling of 21826452913 in words is "twenty-one billion, eight hundred twenty-six million, four hundred fifty-two thousand, nine hundred thirteen".