21300563069 has 2 divisors, whose sum is σ = 21300563070. Its totient is φ = 21300563068.

The previous prime is 21300563027. The next prime is 21300563071. The reversal of 21300563069 is 96036500312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21291187225 + 9375844 = 145915^2 + 3062^2 .

It is a cyclic number.

It is not a de Polignac number, because 21300563069 - 2¹² = 21300558973 is a prime.

It is a super-2 number, since 2×21300563069² (a number of 21 digits) contains 22 as substring.

Together with 21300563071, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21300583069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650281534 + 10650281535.

It is an arithmetic number, because the mean of its divisors is an integer number (10650281535).

Almost surely, 2^21300563069 is an apocalyptic number.

It is an amenable number.

21300563069 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300563069 is an equidigital number, since it uses as much as digits as its factorization.

21300563069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 35.

The spelling of 21300563069 in words is "twenty-one billion, three hundred million, five hundred sixty-three thousand, sixty-nine".