10021210109509 has 2 divisors, whose sum is σ = 10021210109510. Its totient is φ = 10021210109508.

The previous prime is 10021210109483. The next prime is 10021210109569. The reversal of 10021210109509 is 90590101212001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9460391850625 + 560818258884 = 3075775^2 + 748878^2 .

It is a cyclic number.

It is not a de Polignac number, because 10021210109509 - 2⁹ = 10021210108997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10021210109569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010605054754 + 5010605054755.

It is an arithmetic number, because the mean of its divisors is an integer number (5010605054755).

Almost surely, 2^{10021210109509} is an apocalyptic number.

It is an amenable number.

10021210109509 is a deficient number, since it is larger than the sum of its proper divisors (1).

10021210109509 is an equidigital number, since it uses as much as digits as its factorization.

10021210109509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 31.

The spelling of 10021210109509 in words is "ten trillion, twenty-one billion, two hundred ten million, one hundred nine thousand, five hundred nine".