21726820307 has 2 divisors, whose sum is σ = 21726820308. Its totient is φ = 21726820306.

The previous prime is 21726820289. The next prime is 21726820337. The reversal of 21726820307 is 70302862712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21726820307 - 2⁶ = 21726820243 is a prime.

It is not a weakly prime, because it can be changed into another prime (21726820337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10863410153 + 10863410154.

It is an arithmetic number, because the mean of its divisors is an integer number (10863410154).

Almost surely, 2^21726820307 is an apocalyptic number.

21726820307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21726820307 is an equidigital number, since it uses as much as digits as its factorization.

21726820307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 38.

The spelling of 21726820307 in words is "twenty-one billion, seven hundred twenty-six million, eight hundred twenty thousand, three hundred seven".