21795646307 has 2 divisors, whose sum is σ = 21795646308. Its totient is φ = 21795646306.

The previous prime is 21795646211. The next prime is 21795646309. The reversal of 21795646307 is 70364659712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21795646307 - 2²⁸ = 21527210851 is a prime.

Together with 21795646309, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21795646309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10897823153 + 10897823154.

It is an arithmetic number, because the mean of its divisors is an integer number (10897823154).

Almost surely, 2^21795646307 is an apocalyptic number.

21795646307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21795646307 is an equidigital number, since it uses as much as digits as its factorization.

21795646307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 50.

The spelling of 21795646307 in words is "twenty-one billion, seven hundred ninety-five million, six hundred forty-six thousand, three hundred seven".