21277584281 has 2 divisors, whose sum is σ = 21277584282. Its totient is φ = 21277584280.

The previous prime is 21277584269. The next prime is 21277584299. The reversal of 21277584281 is 18248577212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16023509056 + 5254075225 = 126584^2 + 72485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21277584281 is a prime.

It is a super-2 number, since 2×21277584281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21277484281) 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, 10638792140 + 10638792141.

It is an arithmetic number, because the mean of its divisors is an integer number (10638792141).

Almost surely, 2^21277584281 is an apocalyptic number.

It is an amenable number.

21277584281 is a deficient number, since it is larger than the sum of its proper divisors (1).

21277584281 is an equidigital number, since it uses as much as digits as its factorization.

21277584281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 501760, while the sum is 47.

The spelling of 21277584281 in words is "twenty-one billion, two hundred seventy-seven million, five hundred eighty-four thousand, two hundred eighty-one".