21083822749369 has 2 divisors, whose sum is σ = 21083822749370. Its totient is φ = 21083822749368.

The previous prime is 21083822749351. The next prime is 21083822749433. The reversal of 21083822749369 is 96394722838012.

It is an a-pointer prime, because the next prime (21083822749433) can be obtained adding 21083822749369 to its sum of digits (64).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20463753121344 + 620069628025 = 4523688^2 + 787445^2 .

It is a cyclic number.

It is not a de Polignac number, because 21083822749369 - 2¹¹ = 21083822747321 is a prime.

It is a super-2 number, since 2×21083822749369² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21083822749369.

It is not a weakly prime, because it can be changed into another prime (21083822749349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10541911374684 + 10541911374685.

It is an arithmetic number, because the mean of its divisors is an integer number (10541911374685).

Almost surely, 2^{21083822749369} is an apocalyptic number.

It is an amenable number.

21083822749369 is a deficient number, since it is larger than the sum of its proper divisors (1).

21083822749369 is an equidigital number, since it uses as much as digits as its factorization.

21083822749369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62705664, while the sum is 64.

The spelling of 21083822749369 in words is "twenty-one trillion, eighty-three billion, eight hundred twenty-two million, seven hundred forty-nine thousand, three hundred sixty-nine".