21767876671 has 2 divisors, whose sum is σ = 21767876672. Its totient is φ = 21767876670.

The previous prime is 21767876633. The next prime is 21767876759. The reversal of 21767876671 is 17667876712.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21767876671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21767876071) 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, 10883938335 + 10883938336.

It is an arithmetic number, because the mean of its divisors is an integer number (10883938336).

Almost surely, 2^21767876671 is an apocalyptic number.

21767876671 is a deficient number, since it is larger than the sum of its proper divisors (1).

21767876671 is an equidigital number, since it uses as much as digits as its factorization.

21767876671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8297856, while the sum is 58.

The spelling of 21767876671 in words is "twenty-one billion, seven hundred sixty-seven million, eight hundred seventy-six thousand, six hundred seventy-one".