21340030109 has 2 divisors, whose sum is σ = 21340030110. Its totient is φ = 21340030108.

The previous prime is 21340030097. The next prime is 21340030157. The reversal of 21340030109 is 90103004312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15982522084 + 5357508025 = 126422^2 + 73195^2 .

It is a cyclic number.

It is not a de Polignac number, because 21340030109 - 2²⁴ = 21323252893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21340030189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10670015054 + 10670015055.

It is an arithmetic number, because the mean of its divisors is an integer number (10670015055).

Almost surely, 2^21340030109 is an apocalyptic number.

It is an amenable number.

21340030109 is a deficient number, since it is larger than the sum of its proper divisors (1).

21340030109 is an equidigital number, since it uses as much as digits as its factorization.

21340030109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The spelling of 21340030109 in words is "twenty-one billion, three hundred forty million, thirty thousand, one hundred nine".