21483123569 has 2 divisors, whose sum is σ = 21483123570. Its totient is φ = 21483123568.

The previous prime is 21483123539. The next prime is 21483123589. The reversal of 21483123569 is 96532138412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11299690000 + 10183433569 = 106300^2 + 100913^2 .

It is a cyclic number.

It is not a de Polignac number, because 21483123569 - 2¹⁶ = 21483058033 is a prime.

It is a super-2 number, since 2×21483123569² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21483123539) 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, 10741561784 + 10741561785.

It is an arithmetic number, because the mean of its divisors is an integer number (10741561785).

Almost surely, 2^21483123569 is an apocalyptic number.

It is an amenable number.

21483123569 is a deficient number, since it is larger than the sum of its proper divisors (1).

21483123569 is an equidigital number, since it uses as much as digits as its factorization.

21483123569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 44.

The spelling of 21483123569 in words is "twenty-one billion, four hundred eighty-three million, one hundred twenty-three thousand, five hundred sixty-nine".