21286298767 has 2 divisors, whose sum is σ = 21286298768. Its totient is φ = 21286298766.

The previous prime is 21286298749. The next prime is 21286298771. The reversal of 21286298767 is 76789268212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21286298767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21286298777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10643149383 + 10643149384.

It is an arithmetic number, because the mean of its divisors is an integer number (10643149384).

Almost surely, 2^21286298767 is an apocalyptic number.

21286298767 is a deficient number, since it is larger than the sum of its proper divisors (1).

21286298767 is an equidigital number, since it uses as much as digits as its factorization.

21286298767 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8128512, while the sum is 58.

The spelling of 21286298767 in words is "twenty-one billion, two hundred eighty-six million, two hundred ninety-eight thousand, seven hundred sixty-seven".