21300010709 has 2 divisors, whose sum is σ = 21300010710. Its totient is φ = 21300010708.

The previous prime is 21300010703. The next prime is 21300010717. The reversal of 21300010709 is 90701000312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19790299684 + 1509711025 = 140678^2 + 38855^2 .

It is a cyclic number.

It is not a de Polignac number, because 21300010709 - 2²⁴ = 21283233493 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21300010703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650005354 + 10650005355.

It is an arithmetic number, because the mean of its divisors is an integer number (10650005355).

Almost surely, 2^21300010709 is an apocalyptic number.

It is an amenable number.

21300010709 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300010709 is an equidigital number, since it uses as much as digits as its factorization.

21300010709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 23.

The spelling of 21300010709 in words is "twenty-one billion, three hundred million, ten thousand, seven hundred nine".