21014044309 has 2 divisors, whose sum is σ = 21014044310. Its totient is φ = 21014044308.

The previous prime is 21014044283. The next prime is 21014044321. The reversal of 21014044309 is 90344041012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20713542084 + 300502225 = 143922^2 + 17335^2 .

It is a cyclic number.

It is not a de Polignac number, because 21014044309 - 2¹³ = 21014036117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21014044339) 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, 10507022154 + 10507022155.

It is an arithmetic number, because the mean of its divisors is an integer number (10507022155).

Almost surely, 2^21014044309 is an apocalyptic number.

It is an amenable number.

21014044309 is a deficient number, since it is larger than the sum of its proper divisors (1).

21014044309 is an equidigital number, since it uses as much as digits as its factorization.

21014044309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 21014044309 in words is "twenty-one billion, fourteen million, forty-four thousand, three hundred nine".