21344044277 has 2 divisors, whose sum is σ = 21344044278. Its totient is φ = 21344044276.

The previous prime is 21344044273. The next prime is 21344044333. The reversal of 21344044277 is 77244044312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19432081201 + 1911963076 = 139399^2 + 43726^2 .

It is a cyclic number.

It is not a de Polignac number, because 21344044277 - 2² = 21344044273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21344044277.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21344044273) 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, 10672022138 + 10672022139.

It is an arithmetic number, because the mean of its divisors is an integer number (10672022139).

Almost surely, 2^21344044277 is an apocalyptic number.

It is an amenable number.

21344044277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344044277 is an equidigital number, since it uses as much as digits as its factorization.

21344044277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150528, while the sum is 38.

Adding to 21344044277 its reverse (77244044312), we get a palindrome (98588088589).

The spelling of 21344044277 in words is "twenty-one billion, three hundred forty-four million, forty-four thousand, two hundred seventy-seven".