21667076675831 has 2 divisors, whose sum is σ = 21667076675832. Its totient is φ = 21667076675830.

The previous prime is 21667076675809. The next prime is 21667076675879. The reversal of 21667076675831 is 13857667076612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21667076675831 - 2¹⁰ = 21667076674807 is a prime.

It is a super-2 number, since 2×21667076675831² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21667076675801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10833538337915 + 10833538337916.

It is an arithmetic number, because the mean of its divisors is an integer number (10833538337916).

Almost surely, 2^{21667076675831} is an apocalyptic number.

21667076675831 is a deficient number, since it is larger than the sum of its proper divisors (1).

21667076675831 is an equidigital number, since it uses as much as digits as its factorization.

21667076675831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 106686720, while the sum is 65.

The spelling of 21667076675831 in words is "twenty-one trillion, six hundred sixty-seven billion, seventy-six million, six hundred seventy-five thousand, eight hundred thirty-one".