21112310309 has 2 divisors, whose sum is σ = 21112310310. Its totient is φ = 21112310308.

The previous prime is 21112310299. The next prime is 21112310311. The reversal of 21112310309 is 90301321112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19675672900 + 1436637409 = 140270^2 + 37903^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112310309 - 2⁸ = 21112310053 is a prime.

Together with 21112310311, 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 (21112319309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556155154 + 10556155155.

It is an arithmetic number, because the mean of its divisors is an integer number (10556155155).

Almost surely, 2^21112310309 is an apocalyptic number.

It is an amenable number.

21112310309 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112310309 is an equidigital number, since it uses as much as digits as its factorization.

21112310309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 21112310309 in words is "twenty-one billion, one hundred twelve million, three hundred ten thousand, three hundred nine".