21416728870679 has 2 divisors, whose sum is σ = 21416728870680. Its totient is φ = 21416728870678.

The previous prime is 21416728870619. The next prime is 21416728870711. The reversal of 21416728870679 is 97607882761412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21416728870679 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21416728870609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10708364435339 + 10708364435340.

It is an arithmetic number, because the mean of its divisors is an integer number (10708364435340).

Almost surely, 2^{21416728870679} is an apocalyptic number.

21416728870679 is a deficient number, since it is larger than the sum of its proper divisors (1).

21416728870679 is an equidigital number, since it uses as much as digits as its factorization.

21416728870679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113799168, while the sum is 68.

The spelling of 21416728870679 in words is "twenty-one trillion, four hundred sixteen billion, seven hundred twenty-eight million, eight hundred seventy thousand, six hundred seventy-nine".