21340239307 has 2 divisors, whose sum is σ = 21340239308. Its totient is φ = 21340239306.

The previous prime is 21340239259. The next prime is 21340239317. The reversal of 21340239307 is 70393204312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21340239307 is a prime.

It is not a weakly prime, because it can be changed into another prime (21340239317) 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, 10670119653 + 10670119654.

It is an arithmetic number, because the mean of its divisors is an integer number (10670119654).

Almost surely, 2^21340239307 is an apocalyptic number.

21340239307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21340239307 is an equidigital number, since it uses as much as digits as its factorization.

21340239307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 34.

The spelling of 21340239307 in words is "twenty-one billion, three hundred forty million, two hundred thirty-nine thousand, three hundred seven".