21202883281 has 2 divisors, whose sum is σ = 21202883282. Its totient is φ = 21202883280.

The previous prime is 21202883269. The next prime is 21202883297. The reversal of 21202883281 is 18238820212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16993468881 + 4209414400 = 130359^2 + 64880^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202883281 - 2⁵ = 21202883249 is a prime.

It is a super-2 number, since 2×21202883281² (a number of 21 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 21202883281.

It is not a weakly prime, because it can be changed into another prime (21202883981) 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, 10601441640 + 10601441641.

It is an arithmetic number, because the mean of its divisors is an integer number (10601441641).

Almost surely, 2^21202883281 is an apocalyptic number.

It is an amenable number.

21202883281 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202883281 is an equidigital number, since it uses as much as digits as its factorization.

21202883281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24576, while the sum is 37.

The spelling of 21202883281 in words is "twenty-one billion, two hundred two million, eight hundred eighty-three thousand, two hundred eighty-one".